When is the right time to build a pregnancy file? As a hospital and obstetrics department, the purpose of building a pregnancy file is to manage the pregnancy in a uniform and reasonable way, mainly from the health point of view, but of course the earlier the file is built, the better. In Beijing, we may start to prepare to build a file in early pregnancy, and the real file will be built up around 12-15 weeks, but in fact, the file will be pre-built at 7-8 weeks, and the process of building a file book will start, and the real big file book will be built up around 12-15 weeks. In short, the file should be created in the early and middle stages of pregnancy, early file creation is easy to manage, but it is also important to think that some people will have a spontaneous miscarriage before 12 weeks, so it is expected that if some people build too early, the fetus may be stopped within a few days.