After the appearance of true contractions, it means that the performance of the birth, the so-called true contractions, is a regular contraction of the uterus, and accompanied by pain in the stomach, at the beginning of about 10 minutes, the pain once, this time lasting about 30 seconds, with the passage of time, the contractions of the time to grow the interval gradually shortened, can be 1-3 minutes of pain once, each time the pain time lasts about 1 minute. During this period, some people may also experience bleeding or symptoms of breaking of the amniotic fluid, indicating that it is a sign of birth. During this period, you should pay attention to check the change of fetal heart rate, because when the uterus is contracting, it is easy to cause the fetal heart rate to increase, if the heart rate exceeds the normal range, you need to inhale oxygen in time, and if oxygen cannot improve, you should terminate the pregnancy in time to do a cesarean section to avoid intrauterine distress of the fetus.