L.W.
The one thing I've realized is that there's no such thing as normal. He may not be very hungry. Don't push. Remember you're adding them, not replacing the milk and there'll be plenty of time for solids & all their mess. I'd go easy on the bananas too. My daughter would eat them like crazy & then got constipated. Their insides are very sensitive, so just keep it simple & go slow. Follow his lead.
Good Luck!
L.