I have 3 cats, 2 females and 1 male. My older female (Hal) just had 3 kittens 3 days ago. The other female (Nala) started becoming very aggressive towards Hal about a week or two before she gave birth so I kept Hal in a separate bedroom as Nala would attack her every time Nala saw her. My male (and oldest) Kalona would attack Hal every time Nala would as he comes running to Nala's aid EVERY time she screams. I opened the door to the bedroom to check on Hal and her kittens, Hal was using the litter box and Nala dashed in before I could stop her. She ran straight to the kittens and tried to jump in the box to attack them. I somehow managed to make it to her as she was mid leap and she continued her attack on me (quite a feat, considering I'm 7 mo pregnant myself). The kittens are fine and I made it out with several scratches/bites (most of which drew blood). Nala has never been aggressive like this before and I was wondering when I can expect her to return to normal. My husband and I are now extremely concerned with the chances of Nala being aggressive with our son when he arrives (in which we would have to rehome her immediately). What is causing this behavior and what are the chances of there being a problem with our own son?