How much more will I weigh during pregnancy?
It's natural and healthy to put on weight during pregnancy. Your body needs to change to accommodate your growing baby, and to give him the best start in life. Weight gain in pregnancy varies greatly. Most pregnant women gain between 10kg and 12.5kg (22lb to 26lb), putting most of the weight on after week 20. It also depends on your weight before you become pregnant. By the time you reach your expected delivery date just over a third of your extra weight will come from your baby, the placenta and amniotic fluid. Here are some averages:
- At birth, a baby weighs about 3.3kg (7.3lb).
- The placenta, which keeps your baby nourished, weighs 0.7kg (1.5lb).
- The amniotic fluid, which supports and cushions your baby, weighs 0.8kg (1.8lb).
The other two thirds of extra weight is due to the changes that happen to your body while you're pregnant. On average:
- The muscle layer of your uterus (womb) grows dramatically, and weighs an extra 0.9kg (2lb).
- Your blood volume increases, and weighs an extra 1.2kg (2.6lb).
- You have extra fluid in your body, weighing about 1.2kg (2.6lb).
- Your breasts weigh an extra 0.4kg (0.9lb).
- You store fat, about 4kg (8.8lb), to give you energy for breastfeeding.
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