It is normal for a pregnant woman in her 16th week of pregnancy to gain about 4 to 5 kilograms of weight due to the increase in the size of the fetus in her body, the increase in amniotic fluid, etc., but it is not necessarily true how much each person gains. A 16-week pregnant woman’s weight gain of 4 to 5 kilograms is within the normal range. If the pregnant woman has a serious reaction to vomiting during pregnancy, the weight gain may not be too much, but if the pregnant woman consumes more calories during pregnancy, it may lead to more weight gain, but as long as the fetus is relatively normal, basically there is no great impact. Pregnant women are advised to take good care of themselves during pregnancy, go to the maternity checkups on time, consult their doctors in time when they encounter abnormalities, complete the relevant examinations and follow the doctor’s advice.