You will need your ID card or residence permit, birth certificate, medical insurance card, maternity insurance certificate, marriage certificate, household register, and relevant ultrasound test results to prove that you are pregnant in utero. It is recommended to go to the maternal and child health center where the household registration is located to have the file opened. The documents required for the file opening may vary slightly from place to place, so bring as much as possible to avoid delaying the file opening due to incomplete documents. In addition, it is recommended that the pregnant woman go on an empty stomach when the file is opened, because some laboratory tests will be done to clarify whether the pregnant woman has serious medical or surgical diseases, so as to avoid threats to the life of the pregnant woman and the fetus. Common tests include routine blood, blood type, coagulation function, hepatitis virus, AIDS, syphilis, liver function, kidney function, fasting blood sugar, electrocardiogram, etc. It is recommended to complete the archiving in the first 3 months of pregnancy. After the archiving, the pregnant woman will have a health care booklet, and she should bring the booklet for each prenatal checkup. It is also possible to clarify the physical condition of the pregnant woman throughout the pregnancy, to detect pregnancy complications or fetal abnormalities at an early stage, and to assess the safety of the pregnant woman and the fetus. Therefore, it is recommended that pregnant women have a timely file and have regular prenatal checkups. In case of high-risk pregnant women, it is recommended to increase the number of prenatal checkups.