C.O.
I don't know if you were told this yet, but try putting some rice cereal in with his formula. My daughter did the same thing wanting to eat all the time & waking up in the middle of the night. Or even if he's ready just making some meals as just cereal. I was told that they mey not be hungry all the time either, they're thirsty too. But at night before you put him to sleep do the cereal thing with some of the next age up bottles. It will fill him up making it easier to sleep longer. It worked for me.