36A, but every one is different
The biggest bra size that us girls can have so far is 38kkk
Well if your talking bra sizes then... A A34 bra size is what most girls 12 to 13 wear. A B36 bra size is the bra size right after the A cup.
you can get a bra measure from primark
Your only option is to guess the girl's bra size. If you are not buying her a bra, you don't need to know her bra size. Try to find out something that's important to her instead.
triple z
No, but there are preteen bras that would be in the size of an AAA bra size. It would probably be in the size 12-14 bra.
You can't. All you can do is guess.
what ever size you get or type
There is NOTHING wrong with you, most girls of 12 do NOT wear a regular bra, maybe just a cammisole or training bra!
The average bra size for teenage girls can vary widely, but it is generally around A to C cup sizes. It's important to remember that bra size can change frequently during the teenage years due to growth and development.
This depends on the girl and the size of their chest. It will vary between brands and person.
You cannot tell a girl's bra size just by looking unless you have years of experience in professional bra fittings. Unless you are planning to buy her a bra, you really don't need to know. Focus on finding out more about her interests instead.