At 16 weeks of pregnancy the fetus is about 16 centimeters in length, 12 centimeters in parietal length, and weighs about 110 grams. The external genitalia can be seen. Hair has grown on the scalp. The fetus begins to show respiratory movements. The skin is thin, dark red, and has no subcutaneous fat. Fetal movements can be detected in a part of pregnant women. The 16th week of pregnancy is the period of growth and maturity of the fetus. Pregnant women should pay attention to a reasonable diet, balanced nutrition, and reasonable supplementation of nutrients such as proteins, carbohydrates, fats, and vitamins during this period to ensure the health of the pregnant woman and the fetus. If pregnant women feel sick, they should go to the hospital for medical treatment in time.