The cervical mucus plug is a sign of cervical maturation in late pregnancy. The number of days of expulsion varies from person to person, usually ending in 1-2 days, and may take several weeks in longer cases. The cervix gradually shortens and flattens after the full term of a woman’s late pregnancy. The white discharge from the inner cervical opening forms a cervical mucus plug as the cervix flattens. After the onset of labor, the cervical mucus plug is discharged because of hormonal and fetal head descent stimulation, thus preparing for labor. The timing, frequency and amount of cervical mucus plug discharge are related to one’s own constitution. In general, a woman may discharge the cervical mucus plug several times, every time she goes to the toilet, mostly within 1-2 days. In addition, the mucus plug is similar in appearance to thick snot, more elastic and transparent or white in color, which indicates a certain level of labor. Therefore, when the mucus plug is discharged from the cervix, the mother should be careful to keep the area clean and should not use vaginal plugs or irrigation to avoid infection or premature rupture of the membranes.