Outside my house, I found some kittens about a week ago. Three of them were walking around and playing. There was a smaller one who was still crawling. I was worried about him because it could be the runt. I took him to the vet and all the tests came back normal. I have been taking care of him and feeding him. He eats great and goes to the bathroom normally. He bobbs his head around a bit. Not a lot and it's not like he's having spasms, but I was just wondering if this was normal. He seems to be about three weeks. He can walk on all four legs, but he stumbles a bit. I've never owned a cat so I was worried about his head bobbling. Does he just need to get stronger?