Breast buds are the early stages of breast development that occur during puberty in females. These structures are also known as mammary buds, and they are the first signs of breast growth. Other synonyms for breast bud include breast knob, breast bump, and breast nubbin. Some medical professionals refer to them as breast buds, while others may use the term breast doughnut or breast button. Regardless of the terminology used, breast buds are a natural part of the puberty process and indicate that the body is beginning to mature. As puberty progresses, breast buds will develop into full breasts with the potential to produce milk during pregnancy and breastfeeding.