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How Big is Baby Now? Fetal Development Week-by-Week

FIRST TRIMESTER

    Week 3 of Pregnancy

    Your baby-to-be is a teeny-tiny collection of cells smaller than the period at the end of this sentence.

    Week 4 of Pregnancy

    Your little one is now the size of that poppy seed on your whole-wheat bagel.

    Week 5 of Pregnancy

    This week baby resembles a tadpole the size of an orange seed.

    Week 6 of Pregnancy

    Your little sweet pea has grown to the size of a … sweet pea.

    Week 7 of Pregnancy

    Your blueberry-sized baby is hard at work generating brain cells.

    Week 8 of Pregnancy

    This week baby has reached the size of a large raspberry and is growing fast, gaining about a millimeter in length each day.

    Week 9 of Pregnancy

    Your little one is starting to develop muscle, but is only the size of a green olive

    Week 10 of Pregnancy

    Baby has reached the size of a prune and has been busy growing fingernails and hair follicles.

    Week 11 of Pregnancy

    Your little lime-sized love now has even tinier fingers and toes.

    Week 12 of Pregnancy

    Baby now weighs around a half-ounce and is the size of a large plum, about double the size of that raspberry.

    Week 13 of Pregnancy

    As you close out the first trimester of your pregnancy, your baby has grown to the size of a peach. You may not feel too peachy yourself, but the second trimester honeymoon is about to begin.

SECOND TRIMESTER

    Week 14 of Pregnancy

    Welcome to your second trimester! Your wee one is now the size of a large lemon—and he’s sprouting some hair on his little noggin.

    Week 15 of Pregnancy

    By now your baby can wiggle her fingers and toes (cute!) and has reached the size of an orange.

    Week 16 of Pregnancy

    Your apple-sized baby’s ears have developed to the point that she may be able to hear you speaking!

    Week 17 of Pregnancy

    As big as a good-sized onion, your little one now weighs around five ounces. Pucker up! Your baby is also practicing sucking and swallowing.

    Week 18 of Pregnancy

    Baby is now the size of a bell pepper. You may be able to feel him moving around now!

    Week 19 of Pregnancy

    Your little one weighs around eight ounces now and has reached the size of a large mango.

    Week 20 of Pregnancy

    At your pregnancy’s half-way point, baby is the size of a small cantaloupe.

    Week 21 of Pregnancy

    Baby is now the size of a large banana and is sleeping 12 to 14 hours a day (doesn’t that sound heavenly?).

    Week 22 of Pregnancy

    By now your little one has reached a full pound in weight and is the size of a spaghetti squash, about eight inches long.

    Week 23 of Pregnancy

    Now about the size of papaya, your baby is gaining weight quickly now, and your own belly button may start to pop out.

    Week 24 of Pregnancy

    Your baby has reached the approximate length of a (cute) cucumber.

    Week 25 of Pregnancy

    Your little one weighs roughly one and a half pounds now and has reached the size of an ear of corn.

    Week 26 of Pregnancy

    Baby is putting on the ounces, having gained about half a pound since last week. She’s now the size of an acorn squash. And she’s just able to open her eyes!

    Week 27 of Pregnancy

    Up until this week, your baby’s length has been measured from crown to rump. Now it’s time to change to a head-to-toe standard. Now, at nearly 14 inches, baby is around the size of an eggplant.

THIRD TRIMESTER

    Week 28 of Pregnancy

    Welcome to the third trimester! Your little one is now able to dream and has reached the length of a seedless cucumber.

    Week 29 of Pregnancy

    Baby is now the size of a head of cauliflower — but so much more adorable.

    Week 30 of Pregnancy

    Your little love now weighs around three pounds and is the size of a small, plump cabbage.

    Week 31 of Pregnancy

    You’re entering the home stretch now, as baby reaches the size of a butternut squash.

    Week 32 of Pregnancy

    Your coconut-sized baby is practicing sucking and breathing now.

    Week 33 of Pregnancy

    At four and a half pounds, your bundle has reached the size of a head of lettuce.

    Week 34 of Pregnancy

    Your little honey is now as big as a honeydew melon.

    Week 35 of Pregnancy

    Now the size of a very clever pineapple (but without those pointy leaves, thank goodness), your baby is now around 20 inches long and five and a half pounds. Her brain is developing rapidly now.

    Week 36 of Pregnancy

    Baby is now the size of a canary melon and weighs in at around six pounds.

    Week 37 of Pregnancy

    Your doctor may check for labor signs, while your baby prepares for birth by sucking, turning, and breathing in the womb.

    Week 38 of Pregnancy

    Your little one isn’t so little now, having reached the size of a petite personal watermelon. Don’t forget to stay hydrated yourself!

    Week 39 of Pregnancy

    Hang in there! Your baby is now the size of a winter melon — around 21 inches long — and will be soon making his debut!

    Week 40 of Pregnancy

    It’s the official end of your pregnancy — congratulations! Your baby, now the size of a bunch of Swiss chard, should be arriving very soon.

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