M.S.
Chances are it is okay or at least easily correctable. Be sure to tell the doctor what you have stated in your question. Now, my advice is: remember, you could have 12 babies and all 12 could be different and grow at different rates. My 2nd daughter was a premie who the doctors did not think would survive. She is now an adult with a 9 yr old of her own. The gas and colic could be caused by the milk and perhaps he will need to be put on soy or another formula. There are many variables in children and please do not compare yours in any way. Remember, genetics plays an important role and one child may look like you or your husbad (or a combination of the two of you), but the other child might remember a great grandparent. That is part of the fun of raising more than one child. Good luck with both!