Hello, different hospitals have different regulations on establishing maternal and child health records. Generally, you need to bring your ID card, because many hospitals now carry out card-holding for medical treatment. There will be a medical card representing yourself, which will contain all your information, so bring your ID card. As for other documents, it depends on the situation of each hospital. Now you don't need to bring your household registration book, birth certificate and so on.
It is best for expectant mothers to wear loose shoes when they go to the hospital for the first time. Doctors will do some tests, such as B-ultrasound, taking blood pressure, weighing and so on.