At 4-months your little male is still just a kitten himself- she may be practicing mothering or if he's her kitten from her previous litter that maternal instinct might be kicking back in and she wants to be sure he knows who is boss.

The best solution would be to keep them supervised or separated until her new kittens are old enough for her to go in and get spayed (and if he's not already fixed get him neutered now- it's the best time to do it!) so hormones will no longer be affecting their interactions. If cost is a factor in why the female hasn't been spayed yet there are usually programs for reduced fee spay/neuters or else nearby rescue groups or shelters may be able to help you find vets willing to do it on a "sliding scale" for lower income families. With a male and female in the house and a litter of kittens on the way who may not all find homes before they hit reproductive age it's quite easy to get overwhelmed and the more cats you have the more expensive it will be.

Cali answered on 9/17/11. Helpful? / 0