Duffy was a "singleton" foster kitten, which means he was the only one in the litter. They are a bit more of a challenge to foster because they don't have siblings to cuddle or play with. They learn a lot from each other, including to not bite because they get the same treatment back.
So when I foster just one bottle baby, I get a lot more bites and scratches. Of course I do because I am mom, playmate, and everything rolled into one. I still love to foster these little singletons because they bond pretty tightly to me and it is like having a BFF with you all the time! It also helps that they are so small, they really can't do too much damage.
Here is Duffy cute as can be at about 3 weeks old. He walks a little wobbly and and is pretty funny. The biting and scratching comes when he gets a few weeks older, so I enjoy it while it lasts!