How Big Is My Baby in Pregnancy By Week?

Watching your baby grow through pregnancy is a fun way to pass the long nine months. Though sometimes it's really hard to translate all the inches, centimeters, crown to rump lengths etc. So here is a handy chart of common things to help you understand just how big your baby is now during your pregnancy.

Pregnancy Week 4: Mustard Seed

A single mustard seed with a needle
Photo © Gail Shotlander/Getty Image

At only four weeks past your last period, your baby is as big as a mustard seed. A pregnancy test would be positive starting this week of pregnancy. And if you had an ultrasound towards the end of the week you could see a gestational sac.


Pregnancy Week 5: Pomegranate Seed

Pomegranate seeds in spoon
Photo © Sherif A. Wagih ( Images

While a pomegranate seed doesn't seem to be very large, compared to week 4, your baby has grown a lot! The big news this week is that your baby's heart will begin to beat, but even with the most sensitive ultrasound, a transvaginal ultrasound, you typically can't see the heart beat yet, but you can see a yolk sac.


Pregnancy Week 6: Black Eyed Pea

Week 6 Black Eyed Pea
Photo © iStockphoto

This week the placenta really starts forming, but won't take full control of the pregnancy until the end of the first trimester. In bigger news, you can see arm and leg buds beginning!


Pregnancy Week 7: Cranberry

Cranberry Week Seven of Pregnancy
Photo © iStockPhoto

It's hard to believe that something the size of a single cranberry can make you feel so tired or sick. Is your face breaking out too? Ultrasound will show your baby's heart beating this week and the newest development is rudimentary hands!


Pregnancy Week 8: Raspberry

Raspberry 8 Weeks Pregnant
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Your baby is moving on his or her own, but it's still too early for you to feel it in most cases. Soon you're even going to be able to count the finger and toe rays that your baby is busy growing this week. How are you feeling?


Pregnancy Week 9: Brussel Sprout

Brussel Sprouts Week Nine of Pregnancy
Photo © iStockPhoto

Your baby now has testes or ovaries, depending on if the baby is a girl or a boy. While it will still be weeks before you could tell, it's nice to know there is something going on in there. Still lots of wiggling and moving. Your baby weighs a whole gram.


Pregnancy Week 10: Pecan

A handful of pecans
Photo © Shanna Szymczak / EyeEm/Getty Images

Your baby's tail is gone! And the upper lip has formed. Other than that baby has been gaining weight and now weighs as much as four paper clips, that's four grams. That's about the size of a pecan.

  • To find out more about your baby this week, see:

    Pregnancy: Week 10


Pregnancy Week 11: Date

Pregnancy Week 11 Date
Photo © Olmarmar/iStockphoto

Your baby has a really big head - constituting about half his or her body size. This might look odd if you see it on ultrasound, but it will change as your baby grows. Though even at birth the head will be a large proportion of the baby's body. In other news, your baby has fingernails.


Pregnancy Week 12: Clementine

Two clementines in hand
Photo © Foodcollection GesmbH/Getty Images

Your baby is as big as a clementine, also known as Cuties. Using a doppler, your doctor or midwife should be able to hear your cutie's heart beat around this time. It's a great feeling, no? Your baby's brain is also finalizing structures that are present at birth, but there's a lot still to be done.


Pregnancy Week 13: Asian Pear

Asian Pears
Photo © Jill Fromer/Getty Images

Your baby and the placenta weigh about an ounce each. So while your baby may be about the size of an Asian pear, but weight wise, it's a different feel. All 20 baby teeth have formed. But more importantly, you're in the second trimester!


Pregnancy Week 14: Apricot

Pregnancy Week 14 apricot
Photo © Nikolay Pozdeev/iStockphoto

Did you know that your baby can practice breathing in the amniotic fluid? It's pretty amazing. He or she is busy moving around, but it's still a bit early to feel your baby. At about five inches long, your baby is about as big as this apricot.


Pregnancy Week 15: Apple

Pregnancy Week 15 Apple
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So your baby is about as big as an apple, does that mean that you're nearly in maternity clothes? Interestingly enough, your baby's hair pattern is forming. All those scalp swirls and cowlicks...


Pregnancy Week 16: Starfruit

Pregnancy Week 16 Starfruit
Photo © Ann Lerche Johnson/iStockPhoto

The starfruit is about the size of your baby this week, and starry-eyed might explain how you feel about finding out the sex of your baby. A few lucky parents will be able to tell this soon, but many will have to wait.


Pregnancy Week 17: Rutabaga

Pregnancy Week 17 Rutabaga
Photo © Edsweb -

Your baby now weighs more than the placenta. At birth, the baby will be seven times the weight of the average placenta. While no new structures have formed your baby can his or her thumb.


Pregnancy Week 18: Artichoke

Pregnancy Week 18 Artichoke
Photo © Valentyn Volkov/iStockPhoto

Your baby now has finger prints developing which are unique to your baby, even if he or she is a twin. The bones are also continuing to harden or ossify. How are you feeling?


Pregnancy Week 19: Mango

Pregnancy Week 19 Mango
Photo © Serhiy Zavalnyuk/iStockPhoto

Your baby's permanent teeth are forming behind those baby teeth and their body is covered in a fine hair called lanugo. It probably feels like you have a large mango in your belly right now. Your baby weighs about as much as 227 paper clips or 8 ounces.


Pregnancy Week 20: Carrot

Pregnancy Week 20 Carrot
Photo © © Valentyn Volkov/iStockPhoto

If you have a special ultrasound this week, you might find out that your baby is about as long as a carrot. You might also have the opportunity to find out if you're having a girl or a boy. Will you find out or be surprised?


Pregnancy Week 24: Celery

Pregnancy Week 24 Celery
Photo © Leonid Nyshko/iStockPhoto

Your baby doesn't really stretch out much, which is hard to tell by the amount of movement that you're probably feeling. But if he or she were to stretch out, that would be about the length of the celery stalk. Think about that on the next trip down the grocery aisle.

To find out more about your baby these weeks, see:


Pregnancy Week 28: Cauliflower

Pregnancy Week 28 Cauliflower
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Your curled up baby can flash his or her new eyelashes at you now. And at week 28, the baby is starting to curl up tightly and turn head down, the typical position for babies during birth. Imagine a big head of cauliflower all nestled deep in your pelvis.

To find out more about your baby these weeks, see:


Pregnancy Week 32: Pumpkin

Pregnancy Week 32 Pumpkin
Photo © Sarah Lee/iStockPhoto

If you feel like your baby is a small pumpkin in your belly, you'd be right! That heaviness you feel is fairly normal, and despite the feeling of heaviness, your baby isn't going to fall out. Pelvic tilts can be helpful at relieving that discomfort of late pregnancy.

To find out more about your baby these weeks, see:


Pregnancy Week 36: Pineapple

Photo © Saidin Jusoh / EyeEm/Getty Images

Your baby is about as big as the body of a pineapple, all curled up now and getting ready for birth. While there aren't any new structures forming at this time, your baby's brain will see dramatic growth from now until around week 40. This growth helps them breathe and regulate their temperature after birth. So, this time, is important.

To find out more about your baby these weeks, see:


Pregnancy Weeks 40+: Watermelon

Pregnant woman and her partner holding a watermelon
Photo © Photography by Bobi/Getty Images

Just remember, that babies, like watermelons, come in lots of shapes and sizes. The genetic make up of you and your partner can have a lot to do with how big or small you baby is at birth. Though there aren't any good ways to tell how big your baby is before birth, not even ultrasound.

To find out more about your baby these weeks, see:

There will be slight differences in everyone's growth and fetal development. Any problems should be reported to your care provider.


Heppard, M and Garite, T. Acute Obstetrics. Mosby Year Book. 1992.


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