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Curious about how your baby is developing in the womb? Here's a breakdown of fetal development week by week.
The fetal stage of development begins around the ninth week and lasts until birth. This is when the embryo officially turns into a fetus. The fetus gets its assigned sex around nine weeks of pregnancy, although your healthcare provider can’t detect it on ultrasound yet.
Fetal development begins before you even know you're pregnant. Here's what happens early on.
At the end of the tenth week of pregnancy (8 weeks after fertilization), the fetal stage begins. During this stage, the organs and systems that have already formed grow and develop as follows: By 12 weeks of pregnancy: The fetus fills the entire uterine cavity.
Fetal development takes on new meaning in the second trimester. Highlights might include finding out your baby's sex and feeling your baby move. By Mayo Clinic Staff
There are three stages of prenatal development: the germinal, embryonic, and fetal stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
Fetal development. Learn how your baby is conceived and how your baby develops inside the mother's womb.
Fetal development continues during the third trimester. Your baby will open his or her eyes, gain more weight, and prepare for delivery. By Mayo Clinic Staff. The end of your pregnancy is near! By now, you're eager to meet your baby face to face. Your uterus, however, is still a busy place.
Take a peek inside the womb to see how your belly and your baby develop from week to week with this interactive visual pregnancy timeline from WebMD.
During pregnancy, the lining of your uterus thickens and its blood vessels enlarge to provide nourishment to the fetus. As pregnancy progresses, your uterus expands to make room for the fetus. By the time your baby is born, your uterus will have expanded to many times its normal size.