Rule of eights pregnancy dating

Pregnancy usually lasts 40 weeks in humans, beginning from the first day of the woman's last menstrual period, and is divided into three trimesters.

The fetus begins to kick and swallow, although most women still can't feel the baby move at this point.Most healthy babies will weigh 6-9 lb (2.7-4 kg) at birth, and will be about 20 in. The first sign of pregnancy is usually a missed menstrual period, although some women bleed in the beginning.A woman's breasts swell and may become tender as the mammary glands prepare for eventual breastfeeding.This may relieve pressure on the upper abdomen and the lungs, allowing a woman to breathe more easily.However, the new position places more pressure on the bladder.

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