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.

Most Recent

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.

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.

How Big Is Your Baby in First Trimester?

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

Week 11 Ultrasound: What It Would Look Like

Shhh, don't wake your baby! Along with developing sleeping and waking cycles, he or she is growing more into what your newborn will look like at birth. Find out what is going on when you're 11 weeks pregnant.

Baby's Alertness in the Womb

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

Third Trimester Ultrasound Pictures

Most women may only receive one or two ultrasounds during pregnancy, but 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 third trimester.

More Fetal Development

Second Trimester Ultrasound Pictures

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 in the second trimester.

First Trimester Ultrasound Pictures

Do you know what to expect at your first trimester ultrasound? 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 few weeks of life. 

An Embryo Forms: Weeks 4 to 8 of Pregnancy

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