Lower abdominal cramping in late pregnancy is a very common phenomenon and is not a specific sign of birth, so it is not possible to infer how long it will take for the fetus to be born. The lower abdominal swelling in late pregnancy is generally related to the following factors: 1. fetal pelvic: many primiparous mothers only begin to pelvic at 36 weeks, and 1-2 weeks after full pelvic before delivery. In contrast, women in labor may have the possibility of delivery after the fetus is in the pelvis; 2. Contractions in labor: if the feeling of abdominal cramping gradually turns into abdominal pain, and the pain level gradually increases, with shorter and shorter intervals, 4-5 minutes once, not relieved after rest, accompanied by vaginal fluid or vaginal bleeding, then it is a contraction in labor, and the pregnant woman is likely to deliver within 24-48 hours. In late pregnancy, with the increase of fetus and the change of hormone level, the sensitivity of uterus to external stimulation increases, and the uterus will feel the feeling of falling stomach after stimulation, such as holding urine, after activity, pregnant women may feel the feeling of falling abdomen, but not accompanied by vaginal bleeding and vaginal fluid, this feeling of falling stomach in late pregnancy is mostly normal and not an aura of labor. Of course, there are very few pregnant women whose uterine contractions only have the discomfort of lower abdominal cramping without abdominal pain, which may be accompanied by cervical dilatation or even full opening, so the lower abdominal cramping in late pregnancy should be handled individually. After 37 weeks of pregnancy, pregnant women will enter full term and should be ready to deliver at any time. When redness, water breakage and regular contractions appear, they should be admitted to hospital in time for delivery.