Breast buds are small lumps like a blueberry or marble that erupt directly beneath a young girl's aureola and nipple. This is mostly This is mostly being experience by girls between age 10-12 which can happen a bit sooner or even later. http://www.bt24news.com/thelarche-premature-puberty-girls/

Breast buds is one of the early signs of puberty and estrogen effects. Breast buds have also been known to come and go, again not to worry. But at some point the budding will actually progress to breast development and the continuing changes of the breast during puberty