Baby Blood(1990)

It's time to feed the baby.

A cruel circus owner beats and abuses his pregnant wife. One day the circus receives a leopard newly captured in Africa, but the animal soon dies. However, an evil creature that was inside the leopard bursts out of the animal's body, burrows into the wife's body and takes over her fetus. It soon starts demanding blood, and the woman goes searching for victims for her new "baby."