MY boy is getting sooo fat! Do different types of formula cause children to blow up? Or is this just baby fat. Im not really worried about it thinking he will work it off when he starts walking but it would be nice to know what others know.

first, how old is your son?  and second, how much does he weigh? third, how tall is he? fourth, does his dr think hes getting too big?

I personally don't think a baby is ever fat, and once they get really walking and running they will loose the baby fat by age 3 or 4.

My son was 8lbs 3oz when born and by 1mo he was 12lbs 12oz...at 9mo he was 30lbs and now at 2 he's 38lbs and over 3ft.

There is NOTHING wrong with a chunky baby.

I agree. If your doc has given him a clean bill of health - no need to be concerned. After all, aren't all babies chunky!