What all these guys are saying... I have a 9 mo infant foster son and a 17 mo foster son right now and the 9mo is 5lb heavier and taller than the 17 mo. Been downing 8oz bottles since he was 4mo. Everyone is diffrent. As long as they are not eating to the point they are sick let em have it.

The problem with being little miniature humans is that its pretty much impossible to put a perfect standard on anyone, whether its growth, how much they eat, how much they poop etc.... I would say you should only be worried if he's eating less than one or like, six ounces.

Like battlemace said all kids are different. I wouldn't be to worried. Our daughter has been in the other end of eating as she doesn't eat. She is almost 3 now and it's clear that's just her. She is not a eater. Many of the "issues" we were worried about when she was a new born now make complete sense that she is older and her personality has emerged.

My son is 4 months old. the best advice I can give is stop reading books about raising kids because whoever wrote that book didn't raise YOUR kid. Feed him when he cries and stop when he pulls away or spits up a lot of what he just ate. Always remember you are doing a good job no one knows better than you what's right for your child.

Everyone is different. The 'books' can only tell you what's average. As long as he's healthy and getting good reports from his doctor, then don't worry. You'll have plenty of things to worry about your son in the future. Take it from me, I've gone through it 3 times before and am going through all the same currently with my 1 year old. He was born premature and weighed 2 lbs and 12 ounces. Count your lucky stars that you didn't have to deal with that. Good luck man.