How Your Baby Grows in the Second Trimester

From the editors of

Many moms find that they love their second trimester – their baby may not be here yet, but it ’s certainly making an appearance! The day-to-day fetal development of your baby is speeding up in these three months – time to start thinking of baby names! Here’s how your bundle-to-be grows each week in this trimester.

Baby’s Due In…

…24 Weeks

By this week your unborn baby measures between 4.3 and 4.6 inches from head to buttocks and weighs almost 3 ounces (80 grams). Baby's fingernails are now well formed and its legs are longer than its arms. The fine hair that previously covered your baby's body now also covers its head.

…23 Weeks

Your baby's fetal weight has doubled in the past two weeks and is now about 3 1/2 ounces (100 grams). The head-to-rump length of your unborn baby is between 4 1/2 and almost 5 inches.

…22 Weeks

Your growing baby now measures between 5 and 5 1/2 inches from crown to rump and weighs approximately 5.25 ounces (150 grams)! Your baby's heart and circulatory system are still developing and baby will get oxygen from you right up until birth. Blood flows from your baby to the placenta through the umbilical cord so that your blood and baby's never mix during pregnancy.

…21 Weeks

By this week the head-to-buttocks length of your growing baby is between 5 and 6 inches and its weight is almost 7 ounces (200 grams). Between now and delivery your baby's weight will increase more than 15 times! Baby's nervous system continues to grow and mature. The spinal cord and the front, middle, and back sections of the brain have all been established.

…20 Weeks

Although the growth rate has slowed, your unborn baby is still growing steadily all the time. Right now your baby-to-be weighs about 9 ounces (260 grams) and measures between 5 1/2 and 6 1/2 inches, from head to buttocks. Even a baby's skin goes through many changes. When a baby is born, a white substance called vernix, which protects baby's skin from amniotic fluid, covers its body.

…19 Weeks

At the start of your second half of pregnancy, your unborn baby weighs about 10 1/2 ounces (300 grams) and measures just over 7 inches from head to rump.

…18 Weeks

This week your growing baby measures about 7 1/2 inches from crown to rump and weighs slightly more than 12 ounces (350 grams). Also at this point, baby's eyelids and eyebrows are well developed and its fingernails have grown to cover the fingertips.

…17 Weeks

This week your baby weighs almost 1 pound! Your baby's length is about 8 inches from head to buttocks.

…16 Weeks

At this point, your unborn baby weighs just over 1 pound and measures almost 8 1/2 inches from crown to rump.

…15 Weeks

This week your baby-to-be weighs around 1 1/2 pounds and measures almost 9 inches from head to rump.

…14 Weeks

Your unborn baby now weighs almost 2 pounds! The baby's head-to-buttocks length is just over 9 inches.

…13 Weeks

Baby can now be measured in total length, instead of from just head to buttocks. Your unborn baby's new total length is just over 15 inches and it weighs a little more than 2 pounds now. About this time, baby's eyes open and will continue to open and close.

Here's your chance to put your adorable baby on the cover of American Baby magazine!
•Watch Your Unborn Baby Grow!
•All About Your Pregnant Body"
•Quiz: Girl or Boy?
•Quiz: What's Your Maternity Style?
•Life During Pregnancy

Find your favorite baby names - and the meanings, origins and traits associated with them!

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