The danger of contractions to the fetus is reflected in the following aspects: 1, if contractions occur in early pregnancy, it can cause insufficient blood supply to the placenta, which can easily lead to fetal growth retardation, and also increase the possibility of miscarriage, which requires timely medical treatment; 2, the various organs of the baby in the middle of pregnancy are not yet mature, and their viability is relatively poor, if contractions occur at this time, it is easy to cause the fetal heart If the contractions occur at this time, it is easy to cause the fetal heart rate to accelerate or slow down, affecting the growth and development of the fetus; 3. In the late pregnancy, the fetus has been formed, as long as there are no abnormal contractions that are too strong and too long, the regular and short term uterine contractions have a certain ability to withstand, but if there are abnormal contractions in the late pregnancy, it will increase the fetal intrauterine hypoxia symptoms, affecting the fetal breathing, the situation may even lead to fetal death.