Breast buds refer to the small bumps that form on a girl's chest during puberty. They are the early signs of breast development, indicating that a girl's body is beginning to change and grow. Full definition
Most girls get their first period 18 months to three years after the appearance of breast buds. (babycenter.com)
Training bras are generally worn when breast buds first appear and offer minimal coverage and support because at that point a lot of support just isn't needed. (verywellfamily.com)