sound like dear son is your first child eh?
cos' I was also really worried about my first boy not drinking when (supposedly) its milk-milk time... then start stuffing and 'forcing' the teat into his mouth... *laugh*
later did I found out that some babies dont't really follow the feed-every-how-many-hours kind of pattern.
Sometimes they are just not hungry yet.
Sometimes they have wind in the stomach, though not too much, so not so pain, but they feel bloated, so no appetite.
but one thing for sure, if they are hungry, they cry so loud the walls will shake!!!! *laugh*
Then the only thing you'll have to worry is "is the quantity enough" *laugh*
that time he/she will drink, no matter what and very fast too! *wink*
if he/she is NOT drinking milk, yet is happy and NOT CRYING, then dont't need to worry.... really. 'cos that's the case for my elder one too. By worrying, you are giving yourself more white hair. *wink*