The opening of the uterus from the first finger to the third finger is the first part of the incubation period of the first stage of labor, and there is a difference in time between primigravid women, which does not exceed 20 hours for primigravid women and 14 hours for menstruating women. From the first finger to the third finger, is the first part of the first stage of labor latency process, the time needed for individual differences, can not determine the specific time, the first-time mothers and women with a different speed of the opening of the mouth of the uterus, in the case of regular contractions, first-time mothers are generally slower, women with a faster. In general, it takes less than 20 hours for primigravid women and less than 14 hours for menstruating women. Regular checkups are needed during pregnancy, and if you feel unwell during pregnancy, or if there are signs of labor, go to a regular hospital for checkups in a timely manner, and do not blindly take care of yourself, so as not to cause adverse consequences.