Pregnancy Information Center
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A Peek Inside: 5 Amazing Fetal Development Photos
6 Weeks
6 Weeks
At 6 weeks after your last menstrual period, you may not even know you're pregnant yet, but your baby is already rapidly growing! Even though it’s only about the size of a pencil eraser, your baby's heart has begun to separate into chambers and pump blood and its central nervous system, muscles and bones have started to form.
(Pictured: The spinal cord and tiny arm and leg buds. The red area shows a small, forming heart, and the dark spot is the beginning of eyes.)
Attribution: Wellcome Images
By Katherine Solem. Published on July 12, 2010. Updated on November 23, 2015. Katherine Solem is a San Francisco–based health writer and editor.
Reviewed by Elisabeth Aron, MD, FACOG on October 5, 2015.
