The cat’s placenta is severed in the belly. The owner can buy an oxytocin injection to help the uterus contract and expel the placenta. If you are inexperienced, you need to go to a nearby pet hospital to have the doctor remove the placenta. The placenta must be completely expelled when the cat gives birth, otherwise it will become rotten, diseased, etc. in the belly of the female cat, causing the cat to be poisoned.