There is no particular "regular" size. It depends on whether or not you have reached puberty, and even then, there is no specifically "correct" size. Many 11 year olds are not even in need of this type of undergarment yet.
34B
1AA
There is no average since each girl/woman is different and breast size is based on DNA.
It depends on what size your breast size is. Every girl is different, don't worry.
There is no particular size for 15 year old girl's to wear. Every girl is different in size and therefore you should get measured. If you go into shops like Debenhams or La Senza, they will measure your size for free and make sure you are wearing the correct size of bra. i think any size will do if it works for ex) i know a 12 year old size c and another 20 size b
I am a 16 year old girl and I wear the bra size 34AA and when I was 13 my breasts did not even start growing and I did not have a training bra when I was 13. You should talk to your mom or a doctor cause your bra size is not normal for your age.
D
32A or 34A would be average bra size for a 12 year old girl.
30- 36
She could get a sports bra and they are comfortable that's what I had on I am a ten year old girl and have to where cup bras size triple A
Bra sizes have nothing to do with waist size. A slim girl can have a large bra size or a small one. It just depends on her DNA.
There is no "normal" bra size. It varies from girl to girl.