Picture and Explanation of How Your Body and Baby are Growing and Developing at 12 Weeks Pregnant
At 12 weeks pregnant, the placenta is much larger and now produces the endocrine secretions, or hormones, needed to sustain the pregnancy. The uterus is the size of a grapefruit that completely fills the pelvis and rises up into the abdominal cavity, as shown in the picture above. The fundus, the upper end of the uterus, is just above the top of the symphysis. This upward growth of the uterus takes pressure off the bladder and decreases the need for frequent urination. The mucus plug fills the cervical canal.
By this week, the baby has fingernails and toenails and can open and close the fingers. Even though the baby starts to move its hands, legs, and head, you will not feel any movement yet. The baby is now about 3 inches long and weighs about 1 ounce.
Most recent page update: 6/4/2013
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Founded in 1918, Childbirth Connection has joined forces with and become a core program of the National Partnership for Women & Families. Together, these two women's health powerhouses are transforming maternity care in the United States.
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Check out our resource, "Hormonal Physiology of Childbearing: Evidence and Implications for Women, Babies, and Maternity Care"
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