My DD is nearly 10 and measuring a 28a, does she need a bra or will crop tops suffice? She is pretty active and does a lot of dance, she has noticed she has started growing, they aren't sore and she isn't keen on a bra. I dont know what size you 'need' a bra, I rang a local bra shop and they said she did, but I'm not convinced, she is still so young. What size do you go yes you need some proper support?