In general, the frequency of contractions is 2-3 minutes, i.e. regular contractions, which indicate the imminence of labor, and the possibility of delivery is decided according to the degree of fetal head descent. The driving force of labor comes from uterine contractions, which are divided into irregular contractions and regular contractions. Irregular contractions are irregular contractions of the uterus, which are characterized by a feeling of tightness in the lower abdomen, weak in intensity and short in duration, usually without pain in the lower abdomen, without vaginal bleeding and cervical changes, and will not cause labor to occur. Regular contractions refer to 2-3 contractions within 10 minutes, lasting 20-30 seconds, which are the signs of labor. After the opening of the uterus, the strength of the contractions increases and the woman can cooperate with the doctor to hold her breath. In short, if a woman has regular contractions near her due date, she should go to the hospital in time for delivery.