Breast Development. Girls usually begin puberty between the ages of 8 and 13 years old. The earliest sign of puberty in most girls is the development of breast "buds," nickel-sized bumps under the nipple. It is not unusual for breast growth to start on one side before the other. It's also common for breast buds to be somewhat tender or sore.
Breast buds start to occur around nine to ten years of age and is the first sign of puberty. These breast buds continue to undergo different developmental stages that result in formation of normal healthy breasts. Disturbances in these developmental stages along with the disturbance in hormones that contribute in breast formation can be alarming and needs to be consulted with the doctor.
Infant boys and girls can both develop swollen tissue that resembles miniature breasts. You may be a bit disconcerted to see that your baby has what looks to be developing breasts, but breast buds in infants shouldn't be an immediate cause for concern. Breast buds in infants are typically.