Yahoo - their using the litter box

I put a litter box in with the kittens about 4-5 days ago and they have now figured out what it is for. I never thought I would get so excited and be so happy over watching a cat pee. One question though...is it normal for kittens to play really rough with one another. I know there are just playing...but it seems like they are hurting each other. It's so cute though because Bella sits and watches them playing but as soon as one squeals out she jumps in and intervenes...she is such a good attentive mama.

That is how they learn not to play to rough. It's important that they experience that.