There is no such thing as which month is the fastest weight gain during pregnancy, weight gain is faster after the seventh month of pregnancy. A whole pregnancy is divided into three stages: early pregnancy, mid-pregnancy, late pregnancy, early pregnancy is a woman’s three months after successful conception, this stage of weight gain is not fast, there are women with severe vomiting of pregnancy, the weight may drop. Mid-pregnancy is from three to seven months of pregnancy, late pregnancy is after eight months of pregnancy, mid-late pregnancy with the fetus weight, intrauterine amniotic fluid volume increases significantly, weight gain will be more obvious after the seventh, eighth and ninth months of pregnancy. By late pregnancy, pregnant women’s weight increase of no more than zero point five kilograms per week, everyone has a different constitution, the rate of weight gain is not the same, some people will be overweight. It is important to control weight in late pregnancy to avoid adverse pregnancy outcomes or excessive weight gain.