I researched this once before and posted it somewhere, it was an article - but I can't find it! LOL. Breastfeeding won't cause tooth decay for a few reasons. The action of sucking a breast means the milk hardly touches the teeth in the first place (apparently different for bottles). Breastmilk actually has tooth protecting stuff in it (lol - how's that for technical terms? ) Can't think of any more off the top of my head.. but essentially night feeds are not going to harm their teeth. Even if they fall asleep at the breast, the milk doesn't pool around their teeth like it does with a bottle.

Oh, and night feeds can go on for aaaages (way beyond 4 months when the can start teething) so don't let the MCHN make you feel bad if you find yourself still doing plenty of night feeds later on!