Eating Way Too Much?

Travis was born only 2.88kg in end Sept 2007. He is currently only 1 month old but seems to be drinking as much milk as my friend's 4 month old. I'm worried that he has an enlarged stomach due to overfeeding but am getting conflicting views on how much a baby can take in 1 month.. ranging from 60ml - 150ml. Since Travis is taking an average of 90ml-120ml, I guess I shouldn't be worrying so much! Will confirm with the pedi tomorrow when Travis goes for his 2nd Hep B jab.