By the ninth week of pregnancy, the embryo develops into a fetus. There are about 40 weeks to a typical pregnancy. These weeks are divided into three trimesters. What are the three stages of fetal development called? Fetal development is an orderly and intricate process.
By 12 weeks of pregnancy: The fetus fills the entire uterine cavity. As the pregnancy continues, the uterus enlarges as the fetus grows. By about 14 weeks: The sex can be identified on ultrasound. By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving.
fetus, the unborn young of any vertebrate animal, particularly of a mammal, after it has attained the basic form and structure typical of its kind. A brief treatment of the fetus follows. For more information on the human fetus, see pregnancy.
At the 11th week of pregnancy, or the ninth week after conception, your baby now is called a fetus. At this point in pregnancy, the face is broad, the eyes widely separated, the eyelids fused, and the ears are set low on the side of the head.
A healthy first trimester is crucial to the normal development of your baby. You may not be showing much on the outside, but inside, all the major body organs and systems of the fetus are forming.
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