Your young daughter may initially be oblivious to her own breast bud development. For instance, she may put on a clingy shirt and yet have no idea that it’s accentuating the breast buds that have seemingly sprung up overnight. That’s a good time for you to gently suggest it’s time for her to wear a training bra.
At first your daughter may resist the idea. However, eventually she’ll grow accustomed to the notion that she ought to wear a bra on certain occasions, such as when she has phys-ed at school. She’ll realize that the extra support makes her more comfortable during running and strenuous activities. (She’ll also learn that sweaty shirts can make breast buds look as if they magically grew.) Before long you’ll be off shopping together, looking for a new bra.