He may take a few days to adjust to a new home, new smells, new routines. When we bring a new kitten in, we keep it separated for at least a week (and then a vet visit to ensure it isn't going to share anything with the resident population). I usually go and sit in the new kitten's room and talk to it...let it smell my glasses (sunglasses if you don't have glasses)....maybe play a bit with a feather stick toy. Leave a ticking clock in there...maybe a radio on very low.
With a URI, he may not be able to smell his food too well. When he trusts you a bit more, you could wipe a tiny bit of all meat baby food on his paw for him to lick off. If he is in the bathroom, you could turn on the shower really hot to steam up the room a bit for him once in a while..helps clear the sinuses so he can smell food.
...Always in my heart... Mocha....Nov. 13, 2002 - Dec. 6, 2013
.... Slave to Bengal Cats....Luna, Mystik, Simba, Komet, Meli,
Spark, and Star
.....and a collection of kittens at various times.