The majority of the health cards for pregnant women are created after the 12th week of pregnancy. You need to prepare the following documents: 1) ID card, 2) information on previous examinations, ultrasound results, laboratory test results, etc., and previous medical records, 3) birth certificate, and 4) money. When building a maternity health card, you need to measure the size of the pelvis, and also need to do some corresponding tests to understand the current physical development, and also need to do weight measurement, blood pressure measurement, etc., then you can build a maternity health card. In the future, you can bring the maternity health card to the maternity checkup, so that the doctor can understand the past situation through the maternity health card.