10 year old girls are not really supposed to be wearing any kind of cup size.It's best to wear training Bras or sports bras...But if a 10 year old were to wear a cup size it would probably be a 32AA...11,12 and further that's when you really start to wear a cup size.
size 12 or 14
4 1/2
An average would be about 7-8 or 8-9
Usually she would wear age 6-7 or 7-8 sized clothes, but depending on her weight and height, the size could vary dramatically.
Should wear 7/8 or meduim
my 3 year old Jenny wears size 9 but most of her friends wears size 11 or 12.
A 12-year old girl should wear a size 12/14. If the girl is tall, she may want to go up a size so things will fit better.
A 4 or if she was little a 2t and possible a 5 or 6
The average clothing size for a 10-year-old girl is typically around size 8-10. However, children's clothing sizes can vary widely based on brands and individual body types. It is best to refer to specific size charts or take measurements for the most accurate fit.
If you've hit puberty then you dont really have a size until you are like 16 then the average size is 34d. So u should b close to that i guess I am 13 & i wear a 32c, but all my friends wear either 32a or 32aa, so i have big boobs compared to all of them!
Girls 10/12
AA