What week does 3rd trimester begin

28 Weeks Pregnant | Pregnancy

Welcome to the 3rd trimester! Pregnancy is divided into 3 stages, known as trimesters…. and you're now in the 3rd stage. Over the next few weeks, you will probably start to feel a bit more uncomfortable and tired.

What's happening in my body?

You may be getting a bit of heartburn and indigestion. That's down to your growing baby and hormones affecting your digestive system.

Your back will also be under strain, due to the extra weight you're carrying around. Your joints and ligaments will also be looser than usual.

Your ankles, feet and face could be puffing out a bit, particularly when it's hot. This is probably due to water retention, but get it checked out, just in case it's pre-eclampsia. This is a condition where you may feel perfectly well, but then your blood pressure can get dangerously high, very quickly.

Rest can help with a lot of your symptoms, so make sure you get lots of it. But if you are worried about anything at all, talk to your midwife or doctor, or call NHS 111.

3 ways to bust germs

Make sure you know about some of the harmful infections in pregnancy, so that you can do your best to avoid them.

Here are 3 ways you can protect your unborn baby…

1. Wash your hands regularly with soap and water for at least 20 seconds, particularly if you're in contact with children or nappies, as they could carry a virus called CMV (cytomegalovirus).

2. If you have a cat - wear gloves when emptying the cat litter tray, or ask someone else to deal with it. That's because cat poo can contain a bug that causes the dangerous toxoplasmosis infection. You should also wear gloves when gardening, in case you come into contact with animal poo.

3. If you have not had chickenpox let your doctor or midwife know if you come into contact with anyone who could be infectious. The disease can be spread up to 2 days before spots appear, until 5 days afterwards. It's safest for you when there are no new blisters or moist crusts on the spots.

If you're worried about coronavirus, have a look at the guidance from Royal College of Obstetricians and Gynaecologists on coronavirus and pregnancy.

Nosebleeds

Nosebleeds are common in pregnancy, due to hormonal changes, and can even strike when you're asleep. Here's what you can do:

• sit or stand up - don't lie down
• pinch your nose just above your nostrils for 10 to 15 minutes
• lean forward and breathe through your mouth
• put an icepack (or a bag of frozen peas wrapped in a tea towel) at the top of your nose

Read more tips for stopping nosebleeds.

3rd trimester pregnancy symptoms (at 28 weeks)

You may start getting new symptoms now, such as nosebleeds and indigestion.

Your signs of pregnancy could also include:

• sleeping problems (week 19 has information about feeling tired)
• stretch marks (read about stretch marks on week 17's page)
• swollen and bleeding gums (week 13 has information about gum health during pregnancy)
• pains on the side of your baby bump, caused by your expanding womb ("round ligament pains")
• piles (read about piles on week 22's page)
• headaches
• backache
• nosebleeds
• indigestion and heartburn (week 25 talks about digestive problems)
• bloating and constipation (read about bloating on week 16's page)
• leg cramps (week 20 explains how to deal with cramp)
• feeling hot
• dizziness
• swollen hands and feet
• urine infections
• vaginal infections (see week 15 for vaginal health)
• darkened skin on your face or brown patches – this is known as chloasma or the "mask of pregnancy"
• greasier, spotty skin
• thicker and shinier hair

You may also experience symptoms from earlier weeks, such as:

• mood swings (week 8's page has information on mood swings)
• morning sickness (read about dealing with morning sickness on week 6's page)
• weird pregnancy cravings (read about pregnancy cravings on week 5's page)
• a heightened sense of smell
• sore or leaky breasts (read about breast pain on week 14's page) - a white milky pregnancy discharge from your vagina and light spotting (seek medical advice for any bleeding)

Read Tommy's guide to common pregnancy symptoms.

What does my baby look like?

Your baby, or foetus, is around 37.6cm long from head to heel, and weighs about 1kg. That's approximately the size of a pineapple, and the weight of a big bag of brown sugar.

Your baby's heart rate is changing all the time. Around week 5 or 6, when it was first detectable, it was around 110 beats per minute (bpm). Then it soared to around 170 bpm in week 9 and 10. Now, it's slowed down to around 140 bpm and it will be around 130 bpm at birth.

That's still a lot faster than your heart rate, which will be around 80 to 85 beats per minute. This is partly because babies' hearts are so small that they can't pump much blood, but they can make up for this by going faster. It also helps to keep them warm.

Your baby's heart can be heard through a stethoscope. Someone else might be able to hear it by putting an ear to your pregnant belly – give it a go, but it's tricky finding the right spot.

Action stations

It's time to work out where your baby will sleep, and it's best to do this sooner, rather than later, before you start running out of energy. Your baby will spend a lot of time in a cot, so make sure it's safe. If you're buying a new cot, look for the British Standard mark BS EN 716-1. Read more about what you need for your baby.

This week you could also...

You have maternity rights. You can ask for a risk assessment of your work place to ensure that you're working in a safe environment. You should not be lifting heavy things and you may need extra breaks and somewhere to sit. You can also attend antenatal appointments during paid work time.

It's a good time to tone up your pelvic floor muscles. Gentle exercises can help to prevent leakage when you laugh, sneeze or cough. Get the muscles going by pretending that you're having a wee and then stopping midflow. Visit Tommy’s for more ideas about pelvic floor exercises.

Ask your midwife or doctor about online antenatal classes – they start around now. The charity Tommy's has lots of useful information on antenatal classes and preparing you for birth.

Even if you've had children before, they're still worth going to as you can meet other parents-to-be. The NCT offers online antenatal classes with small groups of people that live locally to you.

To keep bones and muscles healthy, we need vitamin D. From late March/early April to the end of September, most people make enough vitamin D from sunlight on their skin. However, between October and early March, you should consider taking a daily vitamin D supplement because we cannot make enough from sunlight.

Some people should take a vitamin D supplement all year round, find out if this applies to you on the NHS website. You just need 10 micrograms (it's the same for grown-ups and kids). Check if you're entitled to free vitamins.

It's recommended that you do 150 minutes of exercise a week while pregnant. You could start off with just 10 minutes of daily exercise - perhaps take a brisk walk outside. Check out Sport England's #StayInWorkOut online exercises (scroll to the pregnancy section). Listen to your body and do what feels right for you.

There's no need to eat for 2. Now you're in the 3rd trimester, you may need an extra 200 calories a day, but that's not much. It's about the same as 2 slices of wholemeal toast and margarine.

Try and eat healthily with plenty of fresh fruit and veg, and avoid processed, fatty and salty foods. You may be able to get free milk, fruit and veg through the Healthy Start scheme.

How are you today? If you're feeling anxious or low, then talk to your midwife or doctor who can point you in the right direction to get all the support that you need. You could also discuss your worries with your partner, friends and family.

You may be worried about your relationship, or money, or having somewhere permanent to live. Don't keep it to yourself. It's important that you ask for help if you need it.

Getting pregnant again is probably the last thing on your mind. However now is a good time to start planning what type of contraception you would like to use after your baby is born. Getting pregnant again could happen sooner than you realise and too short a gap between babies is known to cause problems. Talk to your GP or midwife to help you decide.

You will be offered newborn screening tests for your baby soon after they are born. These screening tests are recommended by the NHS. This is because these tests can make sure that your baby is given appropriate treatment as quickly as possible. Your decisions about whether or not you want this tests will be respected, and health care professionals will support you. Ask your midwife or doctor for more information about newborn screening.

You and your family should follow the government and NHS guidance on coronavirus (COVID-19):

To find out about about COVID-19 and pregnancy, childbirth and breastfeeding, have a look at advice on the:

Third trimester | Pregnancy Birth and Baby

5-minute read

Listen

Once you reach the third trimester of pregnancy, you’re well over half way there. As you look forward to the birth of your baby, there is plenty to plan for and decisions to make. You might find you’re slowing down, or you might be filled with energy to clean, tidy and organise as you prepare for your baby’s arrival. This urge to clean is known as the ‘nesting’ instinct.

What is the third trimester?

Pregnancy is divided into 3 blocks of 3 months each – the first, second and third trimesters. Reaching week 27 of your pregnancy means you’re now in the third and final trimester. While this trimester could end at week 40, in reality it ends whenever your baby is born.

A baby is considered to have been born full-term if it is born in weeks 37 to 42 of pregnancy. A baby born before week 37 is considered premature, and if your baby has not been born by week 42, labour may be induced.

What happens to your body?

As you get closer to the time your baby will be born, here are some things you’ll notice:

• Your skin and ligaments continue to stretch to accommodate your growing baby.
• You get tired easily, and sleeping becomes more difficult.
• You experience heartburn and/or breathlessness, as the baby grows in your abdomen.

While these are all part of a normal pregnancy, you can take steps to minimise discomfort. Speak with your doctor or midwife for suggestions, particularly if you are in pain.

You may also experience Braxton-Hicks contractions, which are a tightening of the muscles of the uterus. They last around 30 seconds, are irregular and not painful. They are not labour contractions, and not a sign that labour has begun.

If this is your first baby, you may notice around 36 weeks that your baby has moved further down into your pelvis. This is often referred to as 'the baby has engaged or dropped'. You will notice more room near your ribs and breathing will become easier, but this also adds more pressure on your bladder (meaning more trips to the toilet).

In the last few weeks of this trimester your body begins to prepare for the coming labour. The cervix begins to soften, and many women notice a ‘show’. The ‘show’ is the release of the mucous plug that sits within the cervical canal during pregnancy, and is an early sign that your labour will soon begin.

Your emotions

During this last stage of pregnancy, you may be worried or anxious about labour and the birth, or about how you will manage as a parent.

Difficulty getting comfortable in bed and frequent bathroom visits can mean poor sleep, which is known to trigger irritability and low mood in some people.

Although most pregnant women see the third trimester as an exciting time and feel positive about the next stage, one in 5 will experience antenatal anxiety or depression. Seek help early if this is how you (or your partner) are feeling.

What happens to the baby?

By week 31, your baby’s lungs are more mature, but are yet to produce surfactant, a substance that helps with breathing once they are born.

By week 36, your baby is about 47cm long and weighs approximately 2. 6kg. Your baby’s head may start to engage or sit lower into your pelvis at this time, getting ready for labour. Around one in 25 of all babies will be in the ‘breech position’, rather than the usual head-down position, at the start of labour. If this is your situation, your doctor or midwife will discuss with you what this means for your labour, what your options are and how your baby might be born.

By 40 weeks, your baby will be about 50cm, and weigh approximately 3.4kg. Developmentally, your baby is now ready to be born.

What to expect with your doctor or midwife?

Through the third trimester you will have frequent antenatal check-ups: about every 4 weeks until 36 weeks, then every 2 weeks after that.

If you haven’t already had them, the following may be offered:

• gestational diabetes check
• strep (streptococcal) B check
• whooping cough (pertussis) vaccination
• flu (influenza) vaccination

How to stay healthy

To give your baby a healthy start, it’s important to eat healthy foods throughout pregnancy. Ensure your diet is varied and includes a range of fresh fruit and vegetables as well as sources of protein, iron and calcium. Don’t forget to drink plenty of water too.

Weight gain is a normal part of pregnancy and most women can expect to gain between 11 and 16kg.

A pregnancy weight gain calculator can be a handy tool to track your weight gain through the third trimester.

Try to stay active throughout pregnancy - even in your third trimester. While it's important to stick with safe, gentle exercise as you get closer to your due date, recommendations state that pregnant women without complications are encouraged to participate in regular exercise as part of a healthy lifestyle.

Things to consider

As you enter the third trimester don’t forget to:

• pack a hospital bag
• book a hospital/birthing centre tour
• arrange a properly-fitted car seat (to bring your baby home)
• consider what you will need when you bring your baby home – what will you buy, can you borrow from family or friends?
• if you have other children (or pets), plan for their care while you are in hospital
• consider shopping ahead – especially for non-perishable staples (tinned foods, bathroom products, etc. )
• cook double portions through your third trimester, and load your freezer for when things get busy once the baby is born

Sources:

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: May 2021

Back To Top

Related pages

• First trimester
• Second trimester
• Pregnancy week-by-week

Need more information?

Third trimester: pregnancy week by week | Raising Children Network

Pregnant? In our pregnancy week by week guide, you can find out what to expect and follow your baby's development during the third trimester.

Read more on raisingchildren.net.au website