heya, I'm afraid I agree with the other mommies--if the baby is using up a full tummy of food, he's using it up, and that's all there is to it ...
I want to offer a recasting of the 'problem,' though ... up until probably the late 20th c., sleeping "through the night" didn't exist, especially for families but also for people in general (I read an analysis of 18th c literature that suggested that there was expected to be a waking at about midnight and a waking at about 4 am, that these things were just assumed, and the assumption can be seen in the literature ... like in the Bible a lot of cultural stuff is assumed, the writers didn't feel the need to mention what people normally ate for lunch, that sort of thing).
For me, with the kids, once I accepted that 'sleeping through the night' was not a logical assumption of how things 'should' be (I decided that before I saw that article), but that multiple wakings must necessarily be survivable (because here we are as a species) ... it all got much easier. It's just something I _do_.
This of course doesn't work for everyone ... my ex never got over the all-night thing.
The other thing I read once was a guy who studied wolves (which are often active during the night) ... waking up every couple of hours when they made noise was killing him ... but then he decided to do as the wolves do, and get up and move around and do something each time he awoke ... this turned out to be key, because he could go right back to sleep, instead of being Vaguely Wakeful for long chunks of time ... I always wondered if this wasn't part of Ex's difficulty, since I was always getting up (and dropping back into exhausted sleep ;) ) and he was always grumbling under the covers at having been wakened ... and apparently never quite getting back to sleep, ouch.
Good Housekeeping recently (December?) ran a counter-cultural article (I always am shocked when a very mainstream mag does this) about how the "8-10 uninterrupted hours" thing is based on studies paid for by the drug companies and performed by the sleep doctors who have the most to gain if most people think they are sleeping "wrong" ... just a further thought.
I talked about that with Ex and he asserts (and I believe him) that he is one of the people the article said actually _do_ need 8-10 hours a night ... but anyhow, things to think about.