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!

Flashback a few years ago to this wild and crazy batch of foster kittens.  Can you believe these 3 are siblings???
They loved their little hammock and would all pile in it together. Fostering kittens can often be quite entertaining. Like all tiny kittens, they got wild and crazy, and in this photo they look like they are clown kittens!

I might be shallow, but I LOVE tiny kitten tails.  They are short and fat, and in this case even have a cute white tip...  Since I foster these tiny underage kittens, I often get to take a funny photo of a particularly cute kitten tail.  And don't get me started on ears that wiggle when they are drinking from their bottle!

Mac was a very special foster kitten.  He loved everyone and liked hanging around with me, literally.  Here he is 5 weeks old when he decided he liked the flannel sling so much, he would join me for hours while I worked.  Of course, I was working at a Humane Society at the time, so kittens tagging along wasn't that unusual.

I started fostering Mac and his two siblings when they were only 2 days old.  They were very young, but also pretty healthy, so the job was just being a good mommy until they were old enough to be adopted.  In the end, I ended up adopting Mac myself, and we still get to hang out together.

This photo happened when I went with a group of employees to an awards ceremony to honor our nonprofit.  I could trust Mac to stay put in the sling, so he came along and got to meet lots of people.  He stole everyone's hearts, and thought this was pretty much his role in the whole thing.