How big is your belly at 10 weeks pregnant? At 10 weeks of pregnancy, the fetus is already well developed, with a length of about 3.1 cm and a weight of about 4 grams. The abdomen at this time will not be particularly obvious. Even for mothers with their first child, the abdomen will not be as big as in the TV series. Usually, before you feel that your belly is getting bigger, you need to know your relatives, friends or even