The period of rapid fetal development is when the fetus is 7~9 months pregnant, this stage of fetal development is relatively fast. After a woman is pregnant, the fetus usually weighs less than 600~700g before the 7th month of pregnancy, and it can weigh up to 1,000g in the 7th month of pregnancy, and all organs are formed, and the speed of growth and development will also be accelerated. The 8th month of pregnancy is the fastest stage of development, generally 200 grams of weight gain per week, the fetus grows nails, hair and subcutaneous fat, until the 9th month of pregnancy when the fetus weighs about 2500g. In late pregnancy, we should pay attention to check the development of the fetus on a regular basis, due to the nutritional status of pregnant women are different, the development of the fetus speed there are individual differences, if the development of the fetus is too fast, we should control the appropriate diet, weight control, to prevent the formation of a huge child, is not conducive to the birth of the fetus; if the development of the fetus small, we should pay attention to a reasonable increase in nutrition, as soon as possible to promote the growth of the fetus. Fetal rapid development should ensure balanced nutrition, eat more vegetables, fruits, and eggs, milk, lean meat and other protein-rich foods to meet the needs of fetal development.