One girl is a size larger than the other.

Totally normal!!!!!!!!

you can get your breasts enhanced if it really bothers you. the surgeon would make them perfectly symmetrical.i know people usually like real breasts over fake breasts but if you're not completely comfortable in your skin, why not make a change? you only live once. that being said this is actually very normal. most girls with this problem just buy a bra in the size of the larger breast and pad the other side. but honestly i doubt that anyone who is lucky enough to see your breasts would mind this anyway ;)

That's very normal don't worry about it .

It's absolutely normal! My right one is a bit larger :-P

Genetics and disruptions in the estrogen cycles have been named as possible causes. It's normal, however I did read about a study a while back that suggests that those with asymmetrical breasts, are at higher risk of breast cancer depending on the increase. So regular mammograms are a must. Sorry for scaring you if I did, but I couldn't in good conscience not mention it.

If by girl you mean boobs; it's normal.

Yeah, it's actually pretty rare for a woman to have two breasts that are exactly the same size. You can pad that side or get surgery if it really bothers you but other people are unlikely to care.

One boob is an entire size bigger than the other

What?