On the 30th day of pregnancy, the cat’s abdomen will begin to enlarge. At this time, the owner can feel the presence of the cubs by gently touching the cat’s belly. By the 45th day of pregnancy, the female cat's nipples will secrete milk. At this time, the kittens have already taken shape and can be touched more clearly. When the female cat is 55 days pregnant, the female cat is about to give birth. The owner needs to prepare a delivery room to facilitate the female cat. Production.