ACGAS!!! Thank you for coming to this little kitty's rescue! He looks a tad older than 3 weeks (since you could sex him, he is prolly older), so, keep up with the feeding, really as often as he seems to want it. I would still stimulate him bum for poop purposes, but, he should be alright, if he is peeing on his own.

Please keep Dudley away from him, and your own hands! I would wash, wash, wash both before and after contact with the kitty to reduce any possible exporsures to both YOU and Dudley...you never know....

USUALLY an introduction between a baby and an adult cat is not an issue. So, once little kitty is vet checked, let Dudley see what all the fuss is about, with supervision, of course.

Good luck and way to rescue!