How long into pregnancy does a cat get morning sickness?

A pregnant cat may show morning sickness at about 3 to 4 weeks, but not all pregnant cats do. If it occurs, temporarily stop feeding and resume appropriate food after it passes.

If vomiting is frequent, take the cat to the vet to ensure the health of the mother and fetuses. Severe sickness may be from vitamin deficiency, so supplement vitamins and calcium under veterinary advice.