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Now 4 oz (112 g), the fetus can hear and urinate, and has established sleep-wake cycles.
Adding 0.5 lb (227 g) a week as the due date approaches, the fetus drops lower into the mother's abdomen and prepares for the onset of labor, which may begin any time between the 37th and 42nd week of gestation.
Kicks from an active baby may cause sharp pains, and lower backaches are common.
More rest is needed as the woman copes with the added stress of extra weight. At about the 36th week in a first pregnancy (later in repeat pregnancies), the baby's head drops down low into the pelvis.
By the third trimester (29-40 weeks), many women begin to experience a range of common symptoms.
Stretch marks may develop on abdomen, breasts, and thighs, and a dark line may appear from the navel to pubic hair. Many women feel hot, sweat easily and often find it hard to get comfortable.
In the second trimester (13-28 weeks) a woman begins to look noticeably pregnant and the enlarged uterus is easy to feel.