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.
Breasts usually start to develop around the age of 9 to 11, but it's normal for them to start earlier or later. If a girl's breasts start to develop at a younger age, this.
Breast development, or the growth of a girl's breasts, is often the first sign of puberty for females.