The entire gestation period is 40 weeks and is divided into early, middle and late stages. Early pregnancy refers to the 3 months before the start of the last menstrual period, i.e. before 12 weeks of gestation. Early pregnancy refers to the period before 12 weeks of gestation, usually at the end of the 12th week of gestation, when the external genitalia of the fetus can first identify its sex and the limbs can move. Early pregnancy is the period of successive differentiation and union of various fetal organs and systems. The middle pregnancy refers to the period from the 13th week of pregnancy to the end of the 27th week of pregnancy, which is an important period of fetal growth and organ development, and the pregnant woman is relatively comfortable. Attention should be paid to strengthening maternal nutrition and regular checkups to monitor fetal development in utero. Therefore, early pregnancy is a critical stage of fetal development, pregnant women should pay attention to rest, ensure a balanced diet and maintain a happy mood. In addition, attention should be paid to avoiding heavy physical labor and prohibiting sexual intercourse.