Bad Gas?

Hi There,

Rescued a kitten (approx 4-5 months old as thought by the vet) yesterday.

He was found living outside of the city under a house with 1 other kitten. He was fixed and vet checked about a week ago (according to the shelter organization) and given his first shots. They told us due to where he was found, his stomach is a bit weak and sometimes cannot handle "rich" food. When we got him home yesterday, he ran straight to the Iams Kitten food we have out for our other 2 kittens and he had a bit of "Fancy Feast" this morning (as they had recommended) he is having awfully bad gas. No sign of any diarrhea or vomiting however.

I gave him his second dose of Revolution today, and his final pill in 10 more days. Is there a specific type of food we should be feeding him, or brand recommendation? I can't imagine his stomach is doing all to well with such bad gas coming from him!