The entire delivery process of a mother cat begins with contractions of the uterine and abdominal muscles and continues until the fetus and fetal membranes are expelled, forming an organic and complete process.

　　At the start of labor, contractions are dominant, with long intervals at first, then contractions strengthen and intervals shorten, pushing the fetus toward the cervix. Next, contractions and straining work together. The intensifying contractions and strong straining cause the fetal membrane to rupture and amniotic fluid to flow out. After several rapid contractions, the first fetus is delivered, though sometimes it takes 30–60 minutes to deliver the first fetus. The cat may emit a sharp cry during delivery. After delivering each fetus, the mother cat often quickly licks the kitten and bites off the umbilical cord. Some mother cats lick themselves clean first, then lick both sides of the kitten. The uterine horns alternate in expelling the fetuses; when there are many fetuses, the horn with more fetuses generally delivers first.

　　The interval between delivering fetuses ranges from 5 to 60 minutes. Usually, two fetuses are delivered in a group, followed by another group of two after 10–90 minutes. The entire delivery of all fetuses is completed within 2–6 hours. Some cats may pause labor after delivering the first one or two fetuses, then continue labor after 12–24 hours.

　　Shortly after each fetus is delivered, its fetal membrane is expelled, though sometimes the membranes of two fetuses or all fetuses are expelled only after all fetuses are born. In most cases, the mother cat eats the fetal membranes herself. (Source：PetsZone)