Shallow to full pelvic entry is usually longer for first-time mothers, about 2-3 weeks, and shorter for menstruating mothers, usually 1-2 weeks. The term “pelvic entry” refers to the entry of the fetal head into the pelvis through the pelvic inlet in preparation for delivery. In contrast, shallow pelvic entry refers to the partial entry of the fetal head into the pelvis, which is not deep and not fully fixed. With frequent pseudo-contractions in late pregnancy, proper activity can make the fetal head continue to go down and change from shallow to full pelvic entry. The time of pelvic entry usually varies from person to person and is related to the condition of the pregnant woman herself, the pelvis and the fetus. Generally, the first-time mothers are in labor half a month before the due date, and it usually takes 2-3 weeks to go from shallow to full pelvic, while for menstruating mothers it usually takes less time, maybe only 1-2 weeks, or even within a short time after the birth. Therefore, the time of fetal insertion does not determine the time of delivery. For some fetuses that are shallowly or semi-pelvic, they can return to the unpelvic state with the change of maternal body position.