If the formula is too cold, he will spit it back at you and go questing for something else.
If the formula is too warm, he will spit it back at you and go questing for something else.
If he's not actually hungry, he will squirm to get put down, then promptly butt/nuzzle you to be picked back up. Repeat. Repeat.
And the cutest thing to see is achaosofkittens fake-running down the hall with Scout scampering behind him. Watching him play "chase" with a week-old baby goat is just precious.