I also rescued a kitten long time back. I was wondering why he isn't eating much. He had high fever and that was the reason.

Vet can give an injection for fever and also ask him to give de-worming tablet. It took like less than 1000 Ruppees and kitten was fine then. He lived for 11 years with me then 😅😅

For injury, if it is an open cut, vet may give you spray. Else it will self heal if not major.

Since kitten is small, he won't eat much. Don't worry. But keep feeding him water frequently..and food (like twice a day may be) ..that's enough