To start a conversation with your daughter about teaching them about bras, it is important to choose a good time to talk, use age-appropriate language, be open and honest, encourage questions, and provide information and resources. It is also important to be open and responsive to her questions and to provide a supportive and non-judgmental environment. Wearing a bra is a personal choice, and it is important to let your daughter know that there is no right or wrong way to feel about it. Providing her with information and resources about bras and bra-wearing can help her feel more informed and empowered to make her own decisions about wearing a bra.