The precursors of an approaching labor in late pregnancy are irregular contractions, the feeling of descending fetus, and seeing red. 1. Irregular contractions: Pregnant women will experience irregular contractions before they give birth. These contractions usually appear at night and disappear during the day. The contractions are very long in interval and short in duration, and the intensity of the contractions is not very strong and will not increase with time. 2. Fetal descent: The prenatal part of the fetus will descend as it enters the pelvis, and the pregnant woman will feel more relaxed in the upper abdomen, but due to the pressure of the prenatal part, the symptom of frequent urination may occur. 3. Seeing red: As the fetal membranes at the endocervix separate from the uterine wall, a little bleeding will occur. Usually 24-48 hours after seeing red, the pregnant woman will start. Pregnant women with these symptoms should be prepared, if there are regular contractions and the mouth of the uterus is open, they should be hospitalized in time for delivery.