Poppyseed To Watermelon: Pregnancy by Week

Watching your baby grow through pregnancy is a fun way to pass the long nine months. In just 40 weeks, your baby will grow from the size of a tiny seed to the size of a watermelon.

Let us show you how big your baby is and how the baby this week develops!

First trimester – Second trimester – Third trimester

First trimester

Week 1 to week 4

Sperm met egg last week, and voilà — you’ve made a baby! Congratulations! If you know you’re 4 weeks pregnant. You might be totally excited, or you might be getting used to the idea of having a baby. You may have no idea that you’re actually pregnant because you won’t be feeling any different. Schedule your first prenatal visit, where they will confirm your pregnancy with a urine or blood test.

Baby’s Weight: Less than 0.04 oz – poppyseed

Week 5

The creation of the brain, spinal cord, heart, and blood vessels is already well under way.

Baby’s Weight: still less than 0.04 oz – appleseed

Week 6

Your little one has tripled in size.

Baby’s Weight: still less than 0.04 oz – sweet pea

Week 7

Baby’s arm buds, which formed last week, now look like paddles.

Baby’s Weight: still less than 0.04 oz – blueberry

Week 8

This week hands and feet have webbed fingers and toes. Soon will be reabsorbed to reveal individual fingers and toes.

Baby’s Weight: still less than 0.04 oz – raspberry

Week 9

Your baby has graduated from embryo to fetus. The digestive tract and reproductive organs are formed, but it’s still too early for even a skilled technician to tell whether you’re having a boy or a girl.

Baby’s Weight: About .07 oz – cherry

Week 10

The baby can stretch its spine. Baby’s eyes and eyelids are more developed and eyebrows are beginning to grow.

Baby’s Weight: 0.14 oz – strawberry

Week 11

From now through week 20 of your pregnancy, baby increase 30-fold in weight and triple in length.

Baby’s Weight: 0.25 oz – lime

Week 12

Fingernails, toenails, and bones are forming, and a fine layer of hair covers most of baby body.

Baby’s Weight: 0.49 oz – plum

Week 13

Vocal cords are beginning to develop.

Baby’s Weight: 0.81 oz – lemon

Read more about your week-by-week pregnancy symptoms and tips to help and guide you.

Second Trimester

Week 14

All of the internal organs formed during the first trimester, and they will continue to mature from now until is the baby born.

Baby’s Weight: 1.52 oz – peach

Week 15

The brain now controls all the muscles in her body; baby is able to move. But if this is your first baby, you probably won’t feel moves for several more weeks.

Baby’s Weight: 2.47 oz – orange

Week 16

The baby can make a fist and even suck its thumb.

Baby’s Weight: 3.53 oz – avocado

Week 17

This is the first time you might feel the baby’s hiccups.

Baby’s Weight: 4.94 oz – pomegranate

Week 18

Tiny fingers now have unique fingerprints! You can even find out if it is a girl or a boy!

Baby’s Weight: 6.70 oz – artichoke

Week 19

Baby starts giving you “hello” jabs at regular intervals, which you may be able to feel if this is your second or third pregnancy. First-time moms still might not feel anything for a few more weeks.

Baby’s Weight: 8.47 oz – mango

Week 20

This week baby may have thin eyebrows and is sprouting some hair on her head.

Baby’s Weight: 10.58 oz – banana

Week 21

Skin now responds to touch. If you put pressure on your belly, baby will move away or push back.

Baby’s Weight: 12.70 oz – endive

Week 22

Lungs are developing rapidly.

Baby’s Weight: 15.17 oz – coconut

Week 23

Baby’s brain and hearing are more developed this week, and baby is beginning to recognize your voice. It’s time to shop for maternity clothes.

Baby’s Weight: 1.10 lb – grapefruit

Week 24

Nostrils are opening now for “practice breathing”.

Baby’s Weight: 1.32 lb – sugar melon

Week 25

Baby may reach out and grab the umbilical cord.

Baby’s Weight: 1.46 lb – cauliflower

Week 26

Eyebrows and eyelashes are well-defined; plus, the baby has more hair on its head this week.

Baby’s Weight: 1.68 lb – kale

Week 27

At this point, the baby may be able to distinguish between your voice and your husband’s or partner’s voice.

This week you can have a 3D ultrasound done!

Baby’s Weight: 1.93 lb – lettuce

Third trimester

Week 28

The baby is beginning to open eyes and blink.

Baby’s Weight: 2.22 lbs – eggplant

Week 29

The skin is still wrinkly, but as fat accumulates, baby will fill out.

Baby’s Weight: 2.54 lbs – acorn squash

Week 30

The baby has cycles of sleeping and waking. After 30 to 90 minutes of snoozing, may give you a kick to let you know its awake.

Baby’s Weight: 2.91 lbs – zucchini

Week 31

This week baby will gain as much as a half-pound per week until it’s born.

Baby’s Weight: 3.31 lbs – asparagus

Week 32

Because the baby’s taste buds are developed, she may acquire a preference for the foods you eat, which she samples when she swallows amniotic fluid.

Baby’s Weight: 3.75 lbs – squash

Week 33

The fine hair that covered the entire body and helped keep warm as develop, is starting to disappear, but there might still be patches of it on shoulders and back.

Baby’s Weight: 4.23 lbs – celery

Week 34

Bones are fully developed by now, and baby is turning head, pirouetting, and moving body from side to side.

Baby’s Weight: 4.73 lbs – butternut squash

Week 35

Preparation for birth, the baby is now upside down.

Baby’s Weight: 5.25 lbs – pineapple

Week 36

Baby’s liver and kidneys are in working order. Circulation and immune systems are basically good to go. Now, the baby is getting closer and closer to being able to breathe on their own.

Baby’s Weight: 5.78 lbs – papaya

Week 37

Because the baby is running out of room in your uterus, it is mostly stretches and wiggles, instead of delivering big kicks.

Baby’s Weight: 6.30 lbs – romaine lettuce

Week 38

Connections are forming in the baby’s brain that will help swallow and even sleep better once it’s born.

Baby’s Weight: 6.80 lbs – winter melon

Week 39

Baby is probably able to flex their limbs now. Baby’s brain is still rapidly developing—they’re getting smarter by the week! Baby’s nails may extend past the fingertips now.

Baby’s Weight: 7.25 lbs – pumpkin

Week 40 to 42

You’re expecting to give birth this week, but don’t worry if your baby decides to stick around a little longer. Many first babies are late, and it will be worth the wait—we promise!

Baby’s Weight: 7.63 to 9 lbs – watermelon

Final Tip: Preparing for Baby 

Make sure you get a baby monitor while prepping for your little one’s arrival. You wouldn’t want to miss out on this important baby gear.

And when it comes to baby monitors, the Annie Baby Monitor shines as a 2-in-1 solution.

The Annie Baby Monitor goes beyond standard monitoring. It not only ensures your baby’s safety and well-being but also features a baby tracker. Tracking your baby’s sleeping and feeding patterns, growth milestones, and more.

So, as you prepare for the arrival of your precious one, make sure the Annie Baby Monitor is on your list of must-have items.

You’ll not just get a baby monitor; you’ll get a valuable tool to support you throughout your parenting journey.

Check out also:

Scroll Up Back to articles

Share your experience with us!

Don't miss anything!