If a pregnant woman is in a state of hunger for a short time, usually the baby will not feel anything because the nutrients and energy stored in her body can be absorbed by the baby. However, if a pregnant woman does not eat for a long time, her blood sugar will drop due to prolonged starvation, which will lead to a decrease in the blood sugar supplied to the baby in the umbilical cord blood, and the baby will feel hungry, which may seriously endanger the baby’s life. Pregnant women in a state of hunger for a long time easily lead to insufficient nutrient intake of the body, thus unable to provide sufficient nutrition for the growth and development of the baby. Malnutrition during pregnancy is not only directly related to pregnancy complications, abnormal baby development and postpartum hemorrhage, but also adversely affects the growth and metabolism of the baby after birth. Therefore, reasonable dietary intake of pregnant women is very important for the health of mother and child. A reasonable diet should be taken during pregnancy, with light, palatable and easily digestible meals, with few and many meals, to ensure the amount of food consumed. Ensure the intake of sufficient carbohydrates, more folic acid-rich foods in early pregnancy, and appropriate increase in fish, eggs and lean meat in the middle and late pregnancy, and appropriate increase in the intake of milk, which is rich in protein and is also a good source of calcium.