It has been said indeed that breastfed babies get colic lesser than those of formula fed babies.
Upon reading the article on colic at kidshealth.org though, It seems that baby Joram did have his bouts with colic as well.
I did think of GERD too. I even kept my baby's regular spitting up or sometimes even forceful vomiting a secret to our pediatrician for fear that baby will have all of those expensive tests not to mention that it may be invasive too.
Anyway, our baby has been feeding well and has a constant increase in this weight which had alleviate my worries and reasoned that the vomiting is either due to overfeeding (which I admit that we're guilty of at times) or to his own poking of his mouth (you know how babies tend to put their hands in their mouth).
I try to keep baby upright and not to overfeed to prevent this though.