Looking for a week-by-week guide to pregnancy? You're in luck! We've got loads of expert-approved info about each week and trimester, including what's up with your growing baby and what changes to expect for yourself.
You'll find stunning fetal development videos, thousands of articles, and helpful tools like our Due Date Calculator and Baby Names Finder. Meet other parents-to-be in our online community, and get all of this and more in our free pregnancy app. Dive in, and congratulations!
First Trimester of Pregnancy
Second Trimester of Pregnancy
Third Trimester of Pregnancy
First Trimester of Pregnancy
2 weeks pregnantOvulation may happen about two weeks after your last period began. If egg meets sperm, you're on your way to being pregnant.
3 weeks pregnantAt 3 weeks after your last period - about 1 week after fertilization - your baby is a tiny ball made up of several hundred cells that are multiplying quickly.
4 weeks pregnantAt 4 weeks, your baby is an embryo made up of two layers, and your primitive placenta is developing.
5 weeks pregnantAt 5 weeks, your tiny embryo is growing like crazy, and you may be noticing pregnancy discomforts like sore breasts and fatigue.
6 weeks pregnantAt 6 weeks, your baby's heart has started beating. You may have morning sickness and sore breasts.
7 weeks pregnantAt 7 weeks, your baby's eyes, nose, mouth, and ears are taking shape. You may need to pee constantly.
8 weeks pregnantAt 8 weeks, your baby's hands and feet are sprouting webbed fingers and toes. You may have nausea and fatigue. And you may make decisions about prenatal tests.
9 weeks pregnantAt 9 weeks, your baby is starting to look more like a tiny human. You may have morning sickness and mood swings.
10 weeks pregnantAt 10 weeks, your baby has finished the most critical part of development! You might be ready for maternity clothes, or at least some new bras.
11 weeks pregnantAt 11 weeks pregnant, your baby's busy kicking and stretching. But you won't feel that for a while yet.
12 weeks pregnantYour baby can curl those tiny toes and make sucking movements when you're 12 weeks pregnant. You may be having heartburn.
13 weeks pregnantAt 13 weeks pregnant, you're in the last week of the first trimester. Your baby now has exquisite fingerprints and is almost 3 inches long.
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Second Trimester of Pregnancy
14 weeks pregnantYour baby is now making expressions with its tiny features. At 14 weeks pregnant, you may be feeling more energetic and less nauseated.
15 weeks pregnantAt 15 weeks, your baby can move their joints and is forming taste buds. Have a stuffy nose? It's a surprising pregnancy side effect.
16 weeks pregnantAt 16 weeks pregnant, you may be having less nausea and fewer mood swings. Your baby is heading into a growth spurt.
17 weeks pregnantAt 17 weeks, your baby's skeleton is changing from soft cartilage to bone, and the umbilical cord is growing stronger and thicker.
18 weeks pregnantYour baby's genitals are developed enough to see on an ultrasound. Hungry? An increase in appetite is normal at 18 weeks pregnant.
19 weeks pregnantAt 19 weeks, hair is sprouting on your baby's scalp. If your sides are aching, it could be round ligament pain.
20 weeks pregnantAt 20 weeks pregnant, you're at the halfway mark in your pregnancy - congrats! Your baby's taste buds are now working.
21 weeks pregnantFeeling your baby move at 21 weeks pregnant? Those early flutters will turn into full-fledged kicks. Cool fact: Your baby has eyebrows now.
22 weeks pregnantAt 22 weeks, your baby may be able to hear your heartbeat. And your growing belly may be turning into a hand magnet.
23 weeks pregnantNow that you're 23 weeks pregnant, your baby has a well-developed sense of movement. Meanwhile, you may notice swelling in your ankles and feet.
24 weeks pregnantAt 24 weeks, your baby is still long and lean -- but that will soon change. And your growing uterus is now the size of a soccer ball.
25 weeks pregnantAt 25 weeks, your little one is starting to add some baby fat and grow more hair. Your hair may be looking extra lustrous, too.
26 weeks pregnantAt 26 weeks, your baby is inhaling and exhaling small amounts of amniotic fluid. This is good practice for breathing.
27 weeks pregnantAt 27 weeks pregnant, you may feel your baby hiccupping. They may also be opening and closing their eyes.
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Third Trimester of Pregnancy
28 weeks pregnantAt 28 weeks pregnant, you're starting your last trimester. Your baby's eyes may be able to see light filtering in through your womb.
29 weeks pregnantAt 29 weeks, your baby's muscles and lungs are maturing, and the head is growing to make room for the developing brain.
30 weeks pregnantAt 30 weeks, your baby weighs more than 3 pounds. You may be battling mood swings, clumsiness, and fatigue.
31 weeks pregnantAt 31 weeks, your baby's strong kicks might be keeping you up at night. You may be feeling Braxton Hicks contractions, too.
32 weeks pregnantYour baby is plumping up! At 32 weeks pregnant, your expanding uterus may cause heartburn and shortness of breath.
33 weeks pregnantAt 33 weeks pregnant, you might be waddling and having trouble getting comfy in bed. Your baby weighs a little more than 4 pounds now.
34 weeks pregnantAt 34 weeks, your baby's central nervous system and lungs are maturing. Dizziness and fatigue may be slowing you down.
35 weeks pregnantAt 35 weeks, your baby is too snug in your womb to do a lot of somersaults, but you'll still feel frequent movements.
36 weeks pregnantYour baby is gaining about an ounce a day now that you're 36 weeks pregnant. You may feel them drop down into your pelvis soon.
37 weeks pregnantAt 37 weeks, your baby's brain and lungs are continuing to mature. You may have more vaginal discharge and occasional contractions.
38 weeks pregnantYour baby has a firm grasp, which you'll soon be able to test in person! At 38 weeks pregnant, it's wise to watch for signs of preeclampsia.
39 weeks pregnantAt 39 weeks pregnant, your baby is full term and waiting to greet the world! If your water breaks, call your healthcare provider.
40 weeks pregnantAt 40 weeks pregnant, your baby is the size of a small pumpkin! Don't worry if you're still pregnant - it's common to go past your due date.
41 weeks pregnantAt 41 weeks pregnant, you'll go into labor or be induced soon. Your baby is ready for the world!
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