Baby At Weeks
Your baby's actual size by week may vary from others. Your health care provider will be able to provide you with the most accurate information about your baby and your pregnancy. Curious about how your baby is developing in the womb? Here's a breakdown of fetal development week by week. Week one of gestation begins on the first day of your last period, followed by ovulation in the second week.
At four weeks of pregnancy, your baby was a cluster of cells. At 11 weeks, the unborn baby became a fetus. Now, the organs, nerves, and muscles are starting to work. Use this information to follow along with what's happening week by week during the second trimester. Explore your baby's growth journey with our comprehensive, interactive fetal development week by week timeline. Learn about key milestones, size comparisons.
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