Fetal Development by Month

Although every baby develops differently, this guide will give you an idea of how your baby is growing and developing throughout your pregnancy.

Fourth Month

Your little one is six to seven inches long and weighs about five ounces now, and is developing reflexes, such as sucking and swallowing and may begin sucking his or her thumb anytime now. His heart pumps about 25 quarts of blood a day, his or her head is starting to become more erect, and the eyes have moved from the side of her head to the front of her face. You may be able to find out whether it's a boy or a girl during an ultrasound as the external sex organs are developed and visible. He or she is also big enough that you may begin to feel him wiggle and kick inside you.

Many women say their second trimester is the most comfortable, fun period of their pregnancy - past the fatigue and nausea of the first trimester, yet not cumbersome and uncomfortable as in the third. This is a great time to begin or resume your exercise routine. Regular, moderate exercise can keep you and your baby healthy, as well as ease some pregnancy symptoms and even ease labor.

See What Happens Next Month!

First Month
Second Month
Third Month
Fourth Month
Fifth Month
Sixth Month
Seventh Month
Eighth Month
Ninth Month