A third grader does not need to wear a bra. A bra is not necessary until breasts begin to form during puberty. This usually happens around sixth grade.
In order to make sure that a 34B bra is your size, you should get a professional to fit you for a bra, retailers like Marks and Spencer offer bra fittings and can measure you to make sure that it is the right size for you.
Well every one is different but the most commen is an a cup
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.
Your bra is just the right size
Bra size is more a function of breast size and chest circumference than age.
You can call your girlfriend and ask for her bra size. If you aren't comfortable asking her, then buy her something that is not a bra.
If your bra makes it hard to breath in, you should wear a larger band size bra. If your boobs don't fit in the cups of your bra, you should wear a larger cup size.
Get yourself fitted.
You can go to the mall or a shop and go yo the bra side with who ever you went with and try to find out what size you are or go to a bra place and have someone mesure you to get the right fitting bra
If the bra is not the right size or fitted right, then it can be extrememly uncomfortable. I personally, have a few bras that I hate wearing, mostly because they aren't the perfect fit. It is advised to go and get a bra size fitting (at Victoria's Secret, they do it for free). Once you find the right size and right bra for your body, you won't even notice you're wearing one!
you can get a bra measure from primark