Sadly, this evening one of the new kittens passed away. Baby Ron is no longer with us. I'm not entirely sure what went wrong, but I suspect Henry suffocated him by laying on him. He has killed several new kittens this way in the past, and I have yet to find a way to keep him away from the babies short of locking him in a cage (which isn't fair to him).
So our wizarding trio has become a duo. Little Harry and Hermione are left. I moved them over to an open space so Henry won't be as likely to want to climb on them. They were in a box. I hope they stick together and don't wander off.