Anyone ever rescued a newborn kitten??

[2up]

My daughter's boyfriend rescued a kitten when he was less than 2 days old. Mommy kitty wouldn't feed or take care of him. He is now a month old and has been being bottle fed kitty formula and being helped to go "potty" as baby kitties need to be.

So, couple of questions now; (I'm babysitting today, by the way) they are trying to introduce solid food, which is dry food mixed with formula. He's just not that into it. At all. Any tips? We heat the formula and put a bit extra of warm formula on the already mixed dry/formula at each feeding. He licks the formula off of it and kind of pushes the rest around.

Also, how and when should a litter box be introduced? The whole rubbing his private parts until he goes just isn't a lot of fun. No, really, its not. lol

Thanks in advance.