It is a very important thing to build a file after pregnancy, after the file is built, there will be special maternal and child health care staff regularly booking pregnant women for pregnancy checkups, timely detection of high-risk phenomena during pregnancy, and intervention and treatment, so what should we pay attention to when building a file during pregnancy?1. The first thing you need to do is to go to the local community health center or township health center to build a file. 2, when building a file, you need to bring relevant valid documents, such as ID cards, birth certificates, etc., and also bring the results of the tests that have been done during pregnancy. 3, when building a file, you need to carry out the necessary tests, and it is best for pregnant women to visit the clinic in the morning on an empty stomach, and if the pregnancy is relatively short, you should hold the urine.