The difference between building a card and not building a card lies in whether the hospital will keep the results of all the obstetric examinations during pregnancy, which are important references for pregnant women during labor and delivery, or when the fetus has abnormalities during pregnancy. This is equivalent to the hospital free for pregnant women to establish a personal file, the results of the examination are included, so pregnant women are best able to in the early stages of pregnancy, the first time to build the card, otherwise to the late stages of pregnancy, the hospital is not able to complete know the pregnant woman throughout the pregnancy of the state of the obstetric examination, but also can not adequately understand the pregnant woman’s physical state and can not predict the possible dangers.