The checkups in the 5th month of pregnancy generally include general checkup, auxiliary checkup, gynecological checkup and special checkup, mainly for evaluating the development of the fetus and the health status of the pregnant woman.1. General checkup: it includes measurement of height, weight, blood pressure, uterine height, abdominal circumference, etc.; 2. Auxiliary checkups: it includes routine blood test, routine urine test, liver function, renal function, and Hepatitis B antibody test, etc. Through routine blood test, the hemoglobin can be checked to see if there is anemia or not. Through routine blood examination of hemoglobin, to determine whether anemia, coagulation function is normal; 3, ultrasound: fetal system ultrasound can screen for fetal structural malformations, such as congenital heart disease, atrial septal defect, ventricular septal defect, arterial conduit failure and tetralogy of Fallot and other serious cardiac malformations, as well as the detection of malformations of the various systems, such as urinary, reproductive, gastrointestinal, neurological and other systems, in addition to checking the position of the placenta to To know whether there is placenta praevia, placental abruption, etc.; 4. Gynecological examination: Intravaginal examination includes knowing whether there is any abnormality in the vagina and cervix, checking whether the degree of uterine enlargement is in line with the gestational week, checking whether there is any abnormality in the uterus and ovary, and checking the vaginal secretion to determine whether there is any infection such as bacteria, trichomonas and mycobacteria. In addition, pregnant women with a history of preterm labor or late miscarriage as well as symptoms of preterm labor need to undergo cervical canal measurements to determine whether preterm labor is likely to occur; 5. Special tests: such as amniocentesis or non-invasive DNA tests, which are mainly used to diagnose chromosomal and genetic abnormalities, and are generally targeted at pregnant women older than 35 years of age or with a clear family history of genetic disorders and other conditions.