He sounds like a cute little one, and also as if he belongs to somebody. If so, I do hope the owners will see your advert, or ask at the shelter. What a lucky boy he was to find you. I bet it will hard parting with him.

I think feeding him a little bit at a time is the right thing to do, or he may just gobble it all up and throw up after.

Good luck finding his owners or a loving home.