When milk comes in breastfeeding
Breastfeeding and Delayed Milk Production
Breastfeeding and Delayed Milk Production | Johns Hopkins MedicineFor the first 2 to 5 days after your baby is born, you will make a small amount of colostrum, which is all a healthy term baby needs. Colostrum is a thick, rich milk that is high in nutrients. Around day 3 through 5, your milk will come in. Here are some things that may cause a delay of your milk coming in:
Severe stress
Cesarean (surgical) delivery
Bleeding after birth
Obesity
Infection or illness with fever
Diabetes
Thyroid conditions
Strict or prolonged bed rest during pregnancy
Milk supply depends on demand (milk removal.) Feeding frequently, when your baby shows hunger cues, is the best way to have a good supply. If you are having trouble with delayed milk production or a decrease in the amount of milk, then first take a look at the number and length of your feedings. And make sure that your baby is able to put his or her mouth around your nipple to nurse (latch on) and can transfer milk from your breast.
If you have a delay in your milk coming in, don’t feel discouraged. Continue to express milk. That means removing milk from your breasts with a breast pump or by hand. And continue to breastfeed often, even if you are supplementing with formula for a few days. Babies who are premature or jaundiced are especially likely to need formula temporarily.
Sometimes a mother has a health condition that may temporarily delay the large increase in milk production usually seen between 3 to 5 days following birth. These mothers may not begin to produce large amounts of milk until 7 to 14 days after giving birth. If this happens to you, don’t feel discouraged. Continue to breastfeed frequently, even if you also must give your baby infant formula for a few days. Babies who are premature or jaundiced are especially likely to need formula temporarily.
Don’t wait to get help if milk supply is ever a concern. The sooner you do, the better. Many communities have breastfeeding support groups that can be a good resource. Contact your healthcare provider if you are having problems breastfeeding. He or she may recommend a lactation consultant, a specialist in breastfeeding.
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When Does Breast Milk Come In & Signs It’s Coming
The look and feel of your colostrum, or early milk, is much different from your mature, later milk - which often comes in around 2 - 5 days after your baby's birth, though every mama’s timing is different.
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So, When Does Breast Milk Come In?
Though colostrum production begins as early as 16 weeks pregnant and should begin to be expressed right away after birth (with some moms even experiencing occasional leakage later in pregnancy), its look and composition differs significantly from your later breast milk. This is because colostrum, or your “first milk”, plays a much different role for your baby than your later breast milk, though both forms are incredibly important to your baby’s wellness and development. Though later breast milk may take some time to “come in” after delivery, your milk production has been in the works since early in your pregnancy, so don’t worry, mama – it’ll be here soon enough!
Moms shouldn’t expect to see large milk volumes in the first few days after birth, though most newborns lose weight during this time. Both of these things are normal and expected, and your colostrum is all your newborn needs until your later milk presents. With that in mind, your later milk – or the breast milk produced as your colostrum transitions to your mature milk – “comes in” about 2 – 5 days after your baby’s birth. “Coming in” refers to the significant increase in volume and changes in composition, though this popular term isn’t necessarily accurate. This is because your colostrum is breast milk and should be fed to your baby as soon as possible after birth. When your mature milk comes in later, however, it is accompanied by some very noticeable symptoms.
Signs Milk Is Coming In
Many women, even first-time moms, know exactly when their breast milk has come in, mainly due to common indicators like:
- Breast engorgement, or the feeling of fullness, heaviness, and/or firmness.
- Swelling of the breasts.
- Breast milk leakage, particularly overnight.
- Flattened nipples and/or skin tightening or firmness around the areolas.
This initial engorgement – and the occasional discomfort that may accompany the first time your milk comes in – will dissipate as your body adjusts to a regular nursing and pumping routine. If your breasts are frequently engorged after your milk comes in, this is a sign that your body is working hard to produce milk and you may not be fully emptying your breasts after a nursing session – be sure to have a breast pump and breast milk storage bags on hand, so you can fully empty your breasts after and between breastfeeding your little one. Your pumped breast milk can be stored in the refrigerator or freezer, so you can start a stockpile for your little one – which can be especially helpful if your partner or another person, such as a babysitter, needs to feed the baby. Just be sure to read up on the latest breast milk storage guidelines and use a helpful feeding and pumping log to ensure none of your precious liquid gold goes to waste!
What Else Should I Know?
Though your body’s breast milk production is kicked into high gear within 30 – 40 hours after you deliver the placenta, your later milk coming in is dictated by the hormonal changes taking place in your body during this time. Because every woman – and every pregnancy – is different, there is a range of days during which breast milk may come in. With that in mind, there is evidence that skin to skin contact, initiating breastfeeding within 30 – 60 minutes after birth, and continuing to nurse early and often (or pumping or hand expressing your colostrum to feed your baby, if there are latching challenges) can positively impact your breast milk production.
If your breasts are very engorged, it can be more difficult for your baby to latch properly. Try softening your breasts before a feeding, such as by taking a warm shower, applying a warm compress to each breast, and/or hand expressing a small volume of milk. You can also apply a cold compress – think a bag of frozen vegetables or an ice pack wrapped in a towel – to reduce swelling and discomfort. Prevent engorgement and reduce your risk of developing mastitis or encountering eventual breast milk supply issues by nursing or pumping frequently.
If you have questions about your breast milk coming in, concerns about supply, or are experiencing difficulties getting into a regular breast milk feeding routine, talk to a lactation consultant right away. The sooner you can address any issues you may be facing, the easier it will be to minimize impact on your future breast milk production. Remember, mama, it’s common to encounter early breast milk feeding challenges – especially if you’re a first-time mom – and it may take some time for your body and hormones to adjust. After all, you just did an amazing thing by welcoming your little one into the world! The most important thing to remember is to persevere and continue finding ways to ensure your baby receives all that great liquid gold that your body is making – whether by pumping, nursing, or a combination of both. As your milk comes in and you adapt to life with a newborn, you and your baby will eventually get into a regular feeding routine. Congratulations on your new bundle of joy – and be sure to enjoy this unique bonding time together!
Breastfeeding a newborn | What to Expect in the First Week
The first week of a baby's life is a wonderful but hectic time, especially if you haven't breastfed before. Our breastfeeding tips will help you settle in as quickly as possible
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The first time after childbirth, mothers are often confused. The body is still recovering, and you are already starting to get to know your newborn baby. The emotional state during this period can be unstable, especially between the second and fifth day, when many women have milk 1 and at the same time postpartum depression begins 2 . In addition, people around often expect (and demand) that a woman come to her senses as soon as possible and become a “super mom”. But the best thing to do this first week is just to be with your baby and get breastfeeding going.
When should I start breastfeeding my newborn?
Try to breastfeed your baby within the first hour after birth. When the baby latch onto the breast and begins sucking rhythmically, it stimulates the mammary gland cells and starts milk production. nine0009 1 It is not for nothing that this time is called the “magic hour”!
“Ideally, the baby should be placed on the mother's stomach immediately after birth so that it can immediately attach to the breast. He won't necessarily eat, but he should be able to,” explains Cathy Garbin, an internationally recognized expert on breastfeeding.
“Hold your baby and let him find the breast on his own and put the nipple in his mouth. This is called the breast-seeking reflex. On the Internet you can watch videos that show what this process looks like. If the baby does not latch onto the nipple on its own, the midwife will help to properly attach it to the breast. But for starters, it’s good to give the baby the opportunity to do it on their own. In this case, the optimal position for the mother is reclining. ” nine0003
Don't spend that special first hour of your baby's life weighing and swaddling—or at least wait until he's suckling for the first time. Enjoy hugs and close skin-to-skin contact. This promotes the production of oxytocin, the hormone of love, in you and your baby, and oxytocin plays a key role in the supply of the first breast milk - colostrum. 3
“As soon as the obstetricians were convinced that our son was healthy, the three of us — me, my husband and our baby — were left to give us the opportunity to get to know each other. It was a very special hour - an hour of awkwardness, turbulent emotions and bliss. During this time, I breastfed my son twice, ”recalls Ellie, a mother of two from the UK. nine0003
Did you know that breastfeeding helps to recover after childbirth? This is because oxytocin stimulates uterine contractions. In the first hours after childbirth, this contributes to the natural release of the placenta and reduces blood loss. 4
What if the birth did not go according to plan?
If you had a cesarean section or other complications during childbirth,
You can still make skin-to-skin contact with your baby and breastfeed him in the first hours after birth. nine0003
“If you can't hold your baby, have your partner do it for you and make skin-to-skin contact with the baby. This will give the baby a sense of security, care and warmth so that he can hold on until you recover, ”Katie advises.
If the baby is unable to breastfeed, it is advisable to start expressing milk as early as possible and do so as often as possible until the baby is able to feed on its own. “While breastfeeding in the first hours after birth lays an excellent foundation for the future, it is not so important,” Cathy reassures. “It is much more important to start lactation so that in the future, if necessary, you can start breastfeeding.” nine0003
To start milk production, you can express milk manually or use a breast pump that can be given to you at the hospital. 5 And with expressed precious colostrum, it will be possible to feed the child. This is especially important if the baby was born premature or weak, since breast milk is extremely healthy.
If a baby was born prematurely or has a medical condition and cannot be breastfed immediately, this is no reason not to continue breastfeeding. “I have worked with many new mothers who were unable to breastfeed their baby for the first six weeks due to preterm labor or other reasons. Nevertheless, all of them later successfully switched to breastfeeding,” says Kathy. nine0003
Does the baby latch on correctly?
Correct breastfeeding is essential for successful breastfeeding 6 , as it determines how effectively the baby will suckle milk and hence grow and develop. Latching on the breast incorrectly can cause sore or damaged nipples, so don't hesitate to ask your doctor to check that your baby is properly attached to the breast, even if you are told that everything is fine and you do not see obvious problems - especially while you are in the hospital. nine0003
“While I was in the hospital, I called the doctor at every feed and asked me to check if I was breastfeeding correctly,” says Emma, mother of two from Australia. - There were several cases when it seemed to me that everything seemed to be right, but it was painful to feed, and the doctor helped me take the baby off the breast and attach it correctly. By the time I was discharged, I had already learned to do it confidently.”
When applying to the breast, point the nipple towards the palate. This will allow the baby to take the nipple and part of the areola under it into their mouth. It will be easier for him to suck if he has both the nipple and part of the areola around in his mouth. nine0009 6
“When a baby latch on properly, it doesn't cause discomfort and it causes a pulling sensation, not pain,” Cathy explains. - The baby's mouth is wide open, the lower lip may be slightly turned outward, and the upper one lies comfortably on the chest. The body language of the child indicates that he is comfortable. There isn't much milk at this early stage, so you probably won't notice your baby swallowing, but he will suckle a lot and nurse frequently. "
How often should a newborn be fed? nine0015
The frequency and duration of breastfeeding in the first week can vary greatly. “The first 24 hours of life are completely different for different children. Someone sleeps a lot (after all, childbirth is tiring!), And someone often eats, says Katie. - Such a variety greatly confuses young mothers. Everyone gives different advice, so it's important to remember that every mother and child is different."
“Colostrum is thicker than mature breast milk and is produced in smaller amounts, but has many benefits. When the baby eats colostrum, he learns to suck, swallow and breathe until milk begins to flow in more volume, ”explains Cathy. nine0003
Milk usually arrives on the second or fourth day after delivery. Until this time, the baby is applied to the breast 8-12 times a day (and sometimes more often!), including at night. 7 Feeding may last 10-15 minutes at this stage, or 45 minutes or even an hour, as the baby is just beginning to develop the muscles and coordination needed to suckle effectively.
“At first, the intensity of feeding is very high, often higher than many people realize, and this is shocking to most new mothers,” says Cathy. - Sometimes mom has no time to go to the toilet, take a shower and have a snack. It usually comes as a surprise." nine0003
Camille, a mother from Australia, experienced this. “The first week, Frankie ate every two hours, day and night, and each time it took half an hour to an hour to feed,” she recalls. “My husband and I were completely exhausted!”
Do I need to feed my newborn on a schedule?
The good news is that frequent feeding promotes lactation and stimulates milk production. 7 The more your baby eats, the more milk you will have. Therefore, forget about feeding your newborn on a schedule - this way he will have less chance of feeding. Try to feed your baby when he signals that he is hungry 8 :
- tossing and turning in her sleep;
- opens eyes;
- turns his head if he feels a touch on his cheek;
- sticks out tongue;
- groans;
- licks lips;
- sucks fingers;
- is naughty;
- whimpers;
- is crying.
Crying is the last sign of hunger, so when in doubt, just offer your baby the breast. If he bursts into tears, it will be more difficult to feed him, especially at first, when both of you are just learning how to do it. As your baby grows, he will likely eat less frequently and take less time to feed, so breastfeeding will seem more predictable. nine0003
Does breastfeeding hurt?
You may have heard that breastfeeding is not painful at all, but in fact, in the first days, many new mothers experience discomfort. And this is not at all surprising, given that the nipples are not used to such frequent and strong sucking.
“Breastfeeding can be uncomfortable for the first couple of days – your body and your baby are just getting used to it. If a baby eats for too long and does not latch well, the sensations are almost the same as from unworn new shoes, Cathy compares. Just as tight shoes can rub your feet, improper suckling can damage your nipples. Prevention is always better than cure, so if the pain persists after a few days of feeding, contact a lactation consultant or healthcare professional. ” nine0003
Maria, a mother from Canada, agrees: “Although my son seemed to latch onto the breast well, he damaged his nipples while feeding, and I was in pain. As it turned out, the reason was a shortened frenulum of the tongue. The breastfeeding specialists at our city clinic have been of great help in diagnosis and treatment.”
In addition, you may experience period cramps during the first few days after breastfeeding, especially if this is not your first baby. This is the so-called postpartum pain. The fact is that oxytocin, which is released during breastfeeding, contributes to further contraction of the uterus to restore its normal size. nine0009 4
When milk arrives, the breasts usually become fuller, firmer and larger than before delivery. In some women, the breasts swell, harden and become very sensitive - swelling of the mammary glands occurs. 10 Frequent breastfeeding relieves these symptoms. For more breast care tips, read our article What is Breast Swelling?
How often does the newborn urinate and defecate?
What goes into the body must go back out. Colostrum
has a laxative effect, helping to eliminate meconium - the original feces. It looks a little scary - black and sticky, like tar. 11 But don't worry, it won't always be like this. Breastfed babies usually have a slightly sweet smell of stool.
How many times a day you will need to change diapers and how the contents should look like, see below.
Day one
- Frequency: once or more.
- Colour: greenish black. nine0087
- Texture: sticky like tar.
Day two
- Frequency: twice or more.
- Colour: dark greenish brown.
- Texture: less sticky.
Day three
- Frequency: twice or more.
- Colour: greenish brown to brownish yellow.
- Texture: non-sticky.
Fourth day and then the entire first month
- Frequency: twice or more.
- Color: yellow (feces should turn yellow no later than by the end of the fourth day).
- Texture: grainy (like mustard with grains interspersed). Leaky and watery.
The baby's urine should be light yellow. On average, babies urinate once a day for the first two days. Starting around the third day, the number of wet diapers increases to three, and from the fifth day onwards, diapers have to be changed five times a day or more often. In addition, during the first few days, the weight of wet diapers increases. nine0009 11
Is the baby getting enough breast milk?
Since very little milk is produced at first,
You may feel that this is not enough for your baby. But if you feed your baby on demand, you will produce exactly as much milk as he needs. If you want to keep the process under control, be guided by the frequency of diaper changes above. If your baby soils less diapers, check with your doctor.
“For the first three or four weeks, most babies just eat and sleep. If the child is worried and constantly asks for a breast, you should consult with your doctor, ”Katie recommends. nine0003
Sometimes the baby may vomit after feeding. If the vomit is the color of milk, this is not a cause for concern. But if there are orange, red, green, brown or black blotches in it, or the child vomits with a "fountain", consult a doctor. You should also consult a doctor if the baby has a high temperature, the fontanel (soft spot on the head) has sunk, blood is found in the stool, and also if the weight recorded at birth has not recovered within two weeks. 11
But if there are no frightening symptoms and the baby is growing at a normal pace, it means that he has enough milk. Soon you will both get used to breastfeeding and establish a more stable routine.
For the next step in breastfeeding, see Breastfeeding in the First Month: What to Expect.
Literature
1 Pang WW, Hartmann PE. Initiation of human lactation: secretory differentiation and secretory activation. J Mammary Gland Biol Neoplasia 2007;12(4):211-221. - Pang, W.W., Hartmann, P.I., "Lactation initiation in the lactating mother: secretory differentiation and secretory activation." G Mammary Gland Biol Neoplasia. 2007;12(4):211-221.
2 Shashi R et al. Postpartum psychiatric disorders: Early diagnosis and management. Indian J Psychiatry . 2015; 57( Suppl 2): S 216– S 221. - Shashi R. et al., Postnatal mental disorders: early diagnosis and treatment. Indian J Saikiatri. 2015; 57(App 2):S216-S221.
3 Moberg KU, Prime DK. Oxytocin effects in mothers and infants during breastfeeding. Infant . 2013;9(6):201-206. - Moberg K, Prime DK, "The effects of oxytocin on mother and child during breastfeeding." nine0201 Infant. 2013;9(6):201-206.
4 Sobhy SI, Mohame NA. The effect of early initiation of breast feeding on the amount of vaginal blood loss during the fourth stage of labor. J Egypt Public Health Assoc . 2004;79(1-2):1-12. - Sobhi SI, Moham NA, "Early initiation of breastfeeding and its effect on vaginal bleeding in the fourth stage of labor." nine0201 G Egypt Public Health Assoc. 2004;79(1-2):1-2.
5 Meier PP et al. Which breast pump for which mother: an evidence-based approach to individualizing breast pump technology. J Perinatol . 2016;36(7):493. - Meyer P.P. et al., Breastpump Selection: A Scientific Approach to Customizing Pumping Technology. J Perinatol (Journal of Perinatology). 2016;36(7):493-499.
6 Cadwell K. Latching - On and Suckling of the Healthy Term Neonate: Breastfeeding Assessment. J Midwifery & Women ’ s 2007;52(6):638-642. — Cadwell, K. , "Latching and sucking in healthy newborns: evaluation of breastfeeding." W Midwifery Women Health. 2007;52(6):638-642.
7 Kent JC et al. Principles for maintaining or increasing breast milk production. 2012;41(1):114-121. - Kent J.S. et al., "Principles for Maintaining and Increasing Milk Production". J Obstet Ginecol Neoneutal Nurs. 2012;41(1):114-121.
8 Australian Breastfeeding Association [ Internet ]. Feeding cues ; 2017 Sep [ cited 2018 Feb ]. - Australian Breastfeeding Association [Internet], Feed Ready Signals; September 2017 [cited February 2018]
9 Jacobs A et al. S3-guidelines for the treatment of inflammatory breast disease during the lactation period. Geburtshilfe Frauenheilkd . 2013;73(12):1202-1208. - Jacobs A. et al., "Guidelines S -3 for the management of inflammatory breast disease during breastfeeding." Geburtskhilfe und Frauenheilkünde. 2013;73(12):1202-1208.
10 Lawrence RA, Lawrence RM. Breastfeeding: A guide for the medical profession. 7th ed. Maryland Heights MO, USA: Elsevier Mosby; 2010. 1128 p . - Lawrence R.A., Lawrence R.M., "Breastfeeding: A guide for healthcare professionals." Seventh edition. Publisher Maryland Heights , Missouri, USA: Elsevier Mosby; 2010. P. 1128.
Breast milk production | Baby's needs
Did you know that the amount of breast milk adapts to your baby's needs? In this article, you will learn amazing facts about breast milk production in the first days, weeks and months. nine0003
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Your body is capable of producing breast milk for your baby at every stage of development. Understanding how milk production “turns on”, what happens to milk when you feed your baby, and why production adjusts to his needs as he grows, will help you start this amazing process in the right way.
First day: milk production at birth
The baby is usually ready to breastfeed from birth. When he grabs the breast and begins to suck rhythmically, the milk-producing cells “turn on” and the formation of the first breast milk, colostrum, starts. 1 Try to feed your baby as much as possible in the first hour of his life, and then as soon as he shows interest in feeding. This will help lay the foundation for good milk production later on. 2
The first days: the arrival of milk
At this stage, the level of progesterone in your body decreases,
pregnancy hormone, which begins to fall after the placenta is released, and the hormones responsible for milk production, prolactin, insulin and hydrocortisone, are included in the work. These hormones will help start milk production. 3 Approximately on the third day of your baby's life, milk will begin to come in, and you will feel that your breasts are full and noticeably firmer. 1
First month: shaping milk production
During the first weeks, your body will be especially sensitive to the amount of milk produced as it learns to produce the right amount. Prolactin levels increase dramatically each time you empty your breasts, thereby helping shape the lactation process. It also contributes to the maturation of your milk in terms of composition. At this stage, transitional milk is produced and the amount continues to grow. nine0009 3.4
For good long-term milk production, it is very important that you are close to your baby during the first few weeks. The more often you breastfeed, the more milk will be produced. This process resembles the law of supply and demand. Each time after emptying the breast, whether it is feeding the baby or pumping, even more milk will be produced.
Remember that it is normal for newborns to eat frequently, perhaps even every 45 minutes, and this does not mean that they are not getting enough milk. Frequent feedings help shape milk production, so feed your baby on demand, not on a schedule. nine0003
“In the first few weeks you may feel like you don’t have enough milk because your baby will be feeding all the time, but that’s okay,” says UK mom-of-two Jo, “We tend to think that the baby wants to eat every few hours, but that is not necessarily the case."
Don't forget that babies also breastfeed for comfort. Breastfeeding helps them calm down and adjust to their new life outside the womb. In addition, feeding helps to establish a connection between you. nine0003
Stable milk production in the first month
If you follow your baby's needs and feed him as often and for as long as he wants, milk production should adjust. 5
Some mothers try to increase the period between feedings so that the breasts can produce more milk during this time, but this should not be done, as this may have the opposite effect. 2
If you are unable to breastfeed directly for the first two weeks, express your milk to build and maintain your milk supply during this critical period and beyond. nine0003
Did you know that feeding your baby extra formula unnecessarily can reduce your milk production? The chest will not receive a signal to increase production, because it will not be emptied. In addition, if the baby sleeps longer after formula, he may miss his usual next feeding time.
This is a kind of “supplementing trap”. After three to four days of formula supplementation, during which the breasts have emptied less, the body will receive a signal that breastfeeding has stopped, and the amount of milk produced will begin to decrease. As a result, the baby will remain hungry and will need additional formula supplementation. And so on in a circle ... As a result, this will lead to really low milk production, and the baby will eat mainly the mixture. nine0003
Breast milk production after six weeks
After a month of breastfeeding, post-feeding bursts of prolactin secretion begin to decrease, milk matures, and the body gets used to producing as much milk as your baby needs. In fact, the chest begins to work "on autopilot." 4 You may also notice at this time that your breasts are softer and your milk flow has stopped.
At this stage, women often have fears of "losing milk". nine0037 However, this only means that milk production has been established and now fully meets the needs of the child. It is noteworthy that although the baby continues to grow, he will consume approximately the same amount of milk both at six weeks and at six months. You may notice that the baby began to suckle the breast longer, but less often. On some days he may eat a little less than usual - his appetite changes in the same way as an adult.
Now your body will produce exactly the amount of milk,
as much as your baby needs. Therefore, the more milk the baby
drinks (or you express), the more it will produce.
How does this happen? The reason for this is thought to be the so-called "feedback lactation inhibitor" that controls milk production. The more milk in the breast, 2 the higher the inhibitor level, so a full breast produces less milk than one that has been emptied.
What is the rate of milk production? nine0015
Mothers often worry about their milk supply and think about how to increase it. However, if the baby is healthy and growing well, problems usually do not arise.
“I was worried that my newborn daughter was not getting enough milk as she was feeding very quickly and always from one breast even though I offered both,” says Marjorie, mother of two in the UK, “But when I pumped from using a breast pump, I was surprised at how much milk I produced, and calmed down. I just had to keep feeding her little and often.” nine0003
Keep in mind, however, that not all mothers are able to express a lot of milk right away. You can also try hand expressing milk and see if there is a change in breast fullness.
If you're worried about your milk supply, read our tips for symptoms of too little or too much milk.
Literature
1 Pang WW, Hartmann PE. Initiation of human lactation: secretory differentiation and secretory activation. J Mammary Gland Biol Neoplasia 2007;12(4):211-221. - Pang, W.W., Hartmann, P.I., "Lactation initiation in the lactating mother: secretory differentiation and secretory activation." G Mammary Gland Biol Neoplasia. 2007;12(4):211-221.
2 Kent JC et al. Principles for maintaining or increasing breast milk production. J Obstet Gynecol Neonatal Nurs . 2012;41(1):114-121. - Kent J.S. et al., "Principles for Maintaining and Increasing Milk Production". G Obstet Ginecol Neoneutal Nurs. 2012;41(1):114-121.
3 Ostrom KM. A review of the hormone prolactin during lactation. Prog Food Nutr Sci .