At 16 weeks’ gestation, the fetus has just entered the middle stage of pregnancy. At this time, the length of the fetus is about 12cm, the length of the top hip is about 6~7cm, and the weight is about 150g. During this period, the genitals, hair and skin of the fetus gradually begin to change, and fetal breathing also begins to appear, generally using the chest cavity to start breathing, and occasionally sucking on its own fingers. At this stage, the fetus’s nutritional needs begin to increase, this time pregnant women need balanced intake of nutrients, pregnant women appropriate supplement a little more protein, calcium, can help the child’s bone development, at the same time pay attention to a balanced diet, avoiding partiality and so on.