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
Visit your local health clinic if you are in the US. Care is free and confidential, and they will help you. You will be OK.
she doesnt
Well your 13 year old might want to wear something that fits her age because now she is in the teenager years. Wear something that they desired but parents approval is always needed
Don't wear underwear.
It depends on the girl!!😊
shoes
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 10 year old girl would likely wear a size 10 to 12. This is just average though, some will wear bigger and some will wear smaller.
my boyfriend has two kids?!
This is perfectly normal. Note: Many boys do not understand why girls want to hide their natural beauty behind a coating of paint. Instead of a girl wearing layers upon layers of "paint", most boys actually prefer a girl without makeup at all. Shine with your beauty the way you are. Do not hide behind a mask only because other people tell you to do so.
a fooler shirt
Be a guy.