A good half, at least, and rising, of all boys in the USA are left intact now. And the comeback to any teasing (and I don't know a single guy who's ever had this problem, cut or not) is always "Wait, you're dissing me because I have more dick than you?". There's not much he can say if he's being teased for being cut, unfortunately. Teasing sucks, sure, but it's going to happen for all kinds of reasons. Unless you're prepared to get your child laser eye surgery, liposuction, a boob job and dye their hair, then don't even go down that road - build up their self-esteem instead. I know a mom living in NY who circed her son about 8 years ago, only to find all his peers were intact. They were all peeing against a tree when they were about six when one said "What's wrong with your dick?" and another chimed in "He's had part of it cut off, like my dad has". The mom never regretted it until then.
Plus, it's no 'less painful' in infancy as they usually use inadequate or no anaesthesia, and he'll have it in a dirty diaper while it's healing. The thing is, he'll probably never decide to get it done anyway, so it's a moot point. Doctors started refusing to do circs about 35-40 years ago where I live and the practice just died out - yet I've still never heard of anyone getting teased for it, even though for a while there would have been a good proportion of cut/intact boys. My husband is intact and he said he can't remember ever being naked around a lot of guys and wouldn't know if his friends are cut or not, but he said regardless, any guy looking at and commenting on another guy's penis would get called out for being gay.
Other than the benefits to sexual function, there are a lot of good reasons not to cut here: http://www.circumstitions.com/Complic.html