3-4 week old kitten

Someone I work with found 2 3-4 week old kittens on a roof of her neighbors house. I'm fostering one (my adult cats are terrified of it) and am wondering how to go about feeding it. I've been giving it wet food, which it's eating well, but I'm just hoping it's not being deprived of something having no formula. I can pick some up tomorrow if nessecary. He even pooped on his own, so does that mean I don't have to rub him to make him go to the bathroom?

Are you sure they are not older then 4 weeks. Sounds like he is a fighter. I think KMR is still needed but others here would know for sure.

He already went to the vet, and her opinion was 3-4 weeks (I think). He walks around, but is still wobbly. He doesn't run or anything, although he's played with my hand and such. His brother (who my sister has) is in far worse shape though, he had fallen off the roof when they found him, so he has some neurological problems

Poor baby... He seems like he is doing good.. Sorry I can be of no help

My kittens are 4 weeks old and eating and pottying on there own. They do still nurse from there mama at times so I would mix KMR in with his food.

You can also warm a little goat's milk (easily purchased at the local grocery store) and place it in a flat saucer-type dish. Be sure to provide fresh water as well in the same way - on a flat saucer.

Is he drinking water on his own? If not, then for sure I would include KMR in some of the feedings each day so he gets his liquids.