Male cat being aggressive to new mommy cat

Our male cat is chewing on the neck of our younger female cat. We've only had her since February and he's been doing this for as long as we've had her. But its gotten worse since she gave birth 12 days ago, she is completely fine and happy.

He will watch her and meow at her. Then, he'll run and jump on her back and bite her neck. He doesn't hump, just tries to stand on her while he bites. She will be wide-eyed for a few seconds and then mew while trying to pull away.

Punishment probably won't work, so what can we do to help him see that chewing on her neck is NOT what we want him to do. We read that punishment won't work, so we should just withold affection. Does that mean we should put him in the bathroom for a time-out or something? Because if we separate them and then "withold affection" he just goes back and does it again.

Is he neutered? Females often go into heat after giving birth. She needs to be spayed as soon as possible and he should be neutered. Until so, keep them separate.

Originally Posted by cheylink

Is he neutered? Females often go into heat after giving birth. She needs to be spayed as soon as possible and he should be neutered. Until so, keep them separate.

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Yes, yes, yes... sounds like he is trying to mate with her. And she CAN get preggy! Keep the separate and get them both fixed ASAP!!!! Keep in mind that even a couple weeks after a boy has been fixed he can still inpregnate a female. There is still... um.... stuff.... hanging around. And it could take a couple of months for the hormones to get out of his system.

How old are the kittens? Check with your vet to see if it is ok to spay while she's still nursing if that's the case.

Oh I should have mentioned both my male cats been neutered at 6months.
The female cat was pregnant before we even got her (we didn't know) ..she was an abandoned cat. So I dont know why else he is trying to bite the back of her neck.

Even neutered boys know when a girl is in heat. Once she's spayed, the situation should improve. Of course, you have to wait until the kittens are weaned to spay her.....hopefully he'll cut it out before then! Maybe she'll get sick of it and whack him good.