Hi K.,
The best piece of advice I can give you ....When you feed your child, it is like a glass of water, you can only put in so much and it will eventualy spill over the top. Your baby is the same, but they spit up. When you are done feeding him, is he rooting and trying to eat more, or does he fall asleep? If you still are not sure call the PED, that is what they are for, and dont ever think you can ask a stupid question when it comes to your child.
I had premature twins, one is at home and one is in the hospital NICU still, I am always asking questions.