Future baby birthday calculator

Future Birthday Calculator | babyMed.com

Tools » Fertility Tools

The babyMed future birthday calculator calculates the right days to have sex if you want the baby to have a specific birth date.

I would like my baby to be born on:

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Created by:

Amos Grünebaum

Updated on June 15, 2021

Once you calculate future birth date and know when to have sex, get your personal fertility report to find out if you are fertile. In order to get pregnant, ovulation has to happen and you need to have sex during your fertile window.

Pinpoint your due date with Obie

With the Obie app, you can accurately predict your pregnancy milestones based on your cycle history.

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Should I focus on a birth season rather than a birth month?

Some women try to calculate pregnancy so that their baby is born under a certain astrological sign or a specific birth date that is meaningful to them. Pregnancy is always unpredictable, so specific forecasts for birth don't always pan out. Of course, it is possible to plan which month you’d like to have your baby. You might want a summer birth for more fun, outdoor birthday parties, or a winter baby so that he or she will get to celebrate during the school year with friends from class. However, the season during which you have your baby could actually have a more important role than birthday planning.

How can the seasons affect birthweight?

A recent study shows that seasonality can actually affect your child’s birth weight. Babies born in the spring months were more likely to have a higher birth weight than those born in the summer months. While you certainly don’t want your baby to be enormous, low birth weight usually indicates that your child did not complete his or her development in the womb.

The cause of these differences could be the temperature of the mother’s environment during the final months of pregnancy. Research shows that women should try to avoid exposing their belly to extreme heat when they’re in their third trimester, as it could affect the child’s development. Saunas and hot tubs are not recommended, and women should avoid them until they’ve given birth.

The same might hold true for the hot summer months. Spending time in direct sunlight might cause a slowing in the development of the fetus, which would cause a lower than average birth weight. The spring months are usually the most temperate, so the fetus will not be exposed to drastic temperature changes between hot and cold, which will allow for a more consistent rate of development.

Of course, seasonal changes are not the only thing that might affect birth weight, so this study should not be taken as the final word. Millions of babies are born in the heat of the summer and they turn out perfectly normal. However, if you’re worried about the heat affecting your fetus before birth, try conceiving in the summer months.

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Calculate your due date: How to find your baby's due date

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First day of my last period

BabyCenter's Due Date Calculator

Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived. The calculator will do the rest.

How is my due date calculated?

There are several ways your due date is determined. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. (Human gestation takes about 38 weeks.)

But very few expectant moms know exactly when they conceived. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. Sperm can live for up to five days inside your fallopian tubes. So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. That's the day you conceive.

So, without knowing the day of conception, how does anyone determine a due date?

First day of your last period

The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it.

If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks.

This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts. And women are more likely to know when their last period started than the day they ovulated.

Conception date

If you do happen to know precisely when you conceived – say, if you were using an ovulation predictor kit or tracking your ovulation symptoms – you can calculate your pregnancy due date based on your conception date. Just choose that calculation method from the pulldown above and put in your date.

Note: Again, you don't necessarily conceive on the day you have sex.

IVF transfer date

If you conceived through IVF, you can calculate your due date using your IVF transfer date. If you had a Day 5 embryo transfer, count 261 days from your transfer date. If you had a Day 3 embryo transfer, count 263 days.

Can my due date change?

Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound scan and found to be much bigger or smaller than expected for gestational age. This is more likely to happen if you have an irregular menstrual cycle length that makes it hard to pinpoint the date of conception.

Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date.

What if I already know my due date?

If you already know your due date, you can use this calculator to see your pregnancy timeline. It will tell you when you'll hit various milestones, and when you may be due for prenatal tests and prenatal visits. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date.

How likely am I to give birth on my due date?

Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife. Only 1 in 20 women delivers on their due date. You're just as likely to go into labor any day during the two weeks before or after.

Want more information about how the weeks, months, and trimesters of pregnancy are counted? See our pregnancy timing chart.

How soon can I take a pregnancy test?

With all this talk about pregnancy due dates, you may be wondering when you can take a pregnancy test. To ensure you get the most accurate reading, it's best to wait a few days after your missed period to take a pregnancy test.

At-home urine tests measure the amount of hCG (human Chorionic Gonadotropin) present in your body. If you take a pregnancy test before you miss your period, you may not get an accurate result, despite what some tests advertise.

If you're getting a blood test in your provider's office, you may get results sooner. These tests also measure the amount of hCG in your bloodstream, but they're more sensitive than at-home urine tests. Blood tests may be able to detect pregnancy six to eight days after ovulation.

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