The period of rapid fetal development generally begins at the seventh month of pregnancy. The period of rapid development of the fetus usually begins at the seventh month of pregnancy. The growth rate will increase to two kilograms in one month, which is the fastest growth of fetal fat. Pregnant women are advised to take reasonable nutritional supplements during the seventh month of pregnancy. In addition, the development of the fetus will get better and better in the seventh month. At this time, the proportion of the head and body of the fetus is more even, and the development of the face and the five senses of the fetus can be clearly observed; moreover, the subcutaneous fat of the fetus has already been formed, and the hair is sparse, and the bones are hard. The sense of hearing of the fetus will also respond accordingly and can hear human voices now. During the period of rapid development of the fetus, pregnant women should pay attention to the reasonable regulation of diet under the guidance of doctors. Avoid over-nutrition, so as not to cause the fetus to grow too fast, or even become a huge child, resulting in difficult labor.