Fetal Development

From a tiny cluster of cells to a bouncing baby - fetal development is an amazing process. Here you'll see pictures of how a fetus develops each week, and each trimester. Plus what's happening to your baby throughout the fetal development process.

First Trimester: Images of Your Developing Baby

Do you know what to expect in the first trimester of pregnancy? We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb during the first trimester. These images reveal all the intricate details of your baby's growth. While most women normally receive one or two ultrasounds during pregnancy, this slideshow of the first trimester of pregnancy gives you a look at each week of development.

Second Trimester: Images of Your Developing Baby

We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb. These images reveal all the intricate details of your baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 2nd trimester of pregnancy gives you a look at each week of development.

Embryo to Fetus: Weeks 9 to 12 of Pregnancy

You're well into your first trimester at this point, and your baby is growing bigger and bigger each day. Watch what it takes for her to become a fetus.

Third Trimester: Images of Your Developing Baby

We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb. These images reveal all the intricate details of your baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 3rd trimester of pregnancy gives you a look at each week of development.

Twins: A Closer Look at Your Developing Babies

Parents.com partnered with the American Institute of Ultrasound Medicine (AIUM) to create this unique peak into a baby's development inside the womb. These images reveal all the intricate details of a baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 3rd trimester of pregnancy gives you a look at each week of development.

Sleep Cycles: Weeks 26 to 30 of Pregnancy

At this point, your baby is awake and asleep at very specific times of the day. Find out about his sleep patterns, and what they mean.

Fetal Movement: Feeling Baby Kick

Experts answer your top questions about your developing baby's movements, from when she'll start kicking to how often you should feel her kick.

Sperm Meets Egg: Weeks 1 to 3 of Pregnancy

Something magical is about to happen! Watch as the ovulation process occurs, and then millions of sperm swim upstream on a quest to fertilize an egg.

How Big Is Your Baby in Third Trimester?

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the third trimester.

Baby's Alertness in the Womb

Learn how your baby moves and experiences life in the womb.

An Embryo Forms: Weeks 4 to 8 of Pregnancy

Chances are you have no idea you're pregnant yetbut your body is already hard at work. Watch as the egg undergoes its wondrous transformation to embryo.

This NFL Star and His Wife Had a Prenatal Testing Scare--Now They're Talking About It

Pro football star Torrey Smith, whose wife is pregnant with baby #2, wrote an honest blog post about their anxiety-inducing prenatal test results.

Your Developing Baby: Week 5

What's going on with your baby in his fifth week in utero? Learn all about fetal development and important pregnancy milestones specific to this week of pregnancy!

Developing Senses: Weeks 22 to 25 of Pregnancy

Your baby's ability to see, hear, smell, taste, and feel are developing stronger each day. Learn which of her senses are already working.

Fetal Development Weeks 9 Through 13

See what's happening with your baby in the third month of your pregnancy.

Your Developing Baby: Week 18

What's going on with your baby in pregnancy week 18? Find out all about important pregnancy milestones and exciting fetal development specific to this week of pregnancy!

The Inside Story: Your Baby in Week Twenty-Five

Baby-to-be is growing even more this week. She'll soon way about 1 1/2 pounds and her eyes will open!

Watch Your Baby Grow

It takes 40 weeks for your baby to grow from the size of a tiny seed to a plump watermelon. Watch it all happen in less than two minutes.

Fetal Development Weeks 1 Through 4

See what's happening with your baby in the first month of your pregnancy.

Fetal Development Weeks 31 Through 35

See what's happening with your baby in the eighth month of your pregnancy.

How Big Is Your Baby in Second Trimester?

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the second trimester.

Your Developing Baby: Week 14

What's going on with your baby in pregnancy week 14? Find out all about important pregnancy milestones and exciting fetal development specific to this week of pregnancy!

Your Developing Baby: Week 30

What's going on with your baby in pregnancy week 30? Find out all about important pregnancy milestones and exciting fetal development specific to this week of pregnancy!

Your Developing Baby: Week 6

What's going on with your baby in his sixth week in utero? Learn all about fetal development and important pregnancy milestones specific to this week of pregnancy!

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