TRACY RUTTER / SCIENCE PHOTO LIBRARY TRACY RUTTER / SCIENCE PHOTO LIBRARY
Pregnant woman's abdomen. Close-up of the abdomen of a pregnant woman at nine months. During the third trimester of pregnancy (29-40 weeks), stretch marks may develop on the abdomen, breasts and thighs in some women. The baby's head engages (drops low into the woman's pelvis) during the 36th week in a first pregnancy, but not until a few weeks later in subsequent pregnancies.
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