My experience may not be your experience! I've heard of lots of kids who didn't care one way or another if there was milk or not. Mine always did, and just kind of quit. I do the 'don't offer, don't refuse' style though at this point. This is my 3rd time around at the whole 'nursing while pregnant' thing.

One definite benefit to nursing the whole way through is that you don't have to start the 'sore nipple cycle' all over again when the new baby comes! Woo-hoo!