IAng,
hmmm...i had this issue too and as usual, kiasu me pose this question to the PD when i sent my boi for jab. He says, babies are smart, they know when they are full or uncomfortable and will reject and spit out milk. Hence, when they do so, jus stop feeding cos' the bb cld have reflux. And the long term effect to that is that the bb may associate discomfort/pain to feeding and then big big problem in the future liao. So, my boi now on demand feed, yep, very heart ache whenever i have to pour away left over milk...like pouring away $$$$. Maybe i shd jus bottoms up his left over milk....hahaha!