Picture and Explanation of How Your Body and Baby are Growing and Developing at 12 Weeks Pregnant

picture 12 weeks pregnant
view larger picture of 12 weeks pregnant diagramview larger picture
12 weeks pregnant picture

Source: The Growing Uterus Charts,
© 1989, 2006 Childbirth Connection

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.

picture of 20 weeks pregnant
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20 Weeks Pregnant

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Childbirth Connection is a national not-for-profit organization founded in 1918 as Maternity Center Association. Our mission is to improve the quality of maternity care through research, education, advocacy and policy. Childbirth Connection promotes safe, effective and satisfying evidence-based maternity care and is a voice for the needs and interests of childbearing families.
Most recent page update: 6/4/2013