Back to Sexual health. Girls develop breasts and start their periods. Boys develop a deeper voice and facial hair will start to appear. But it's different for everyone, so don't worry if your child reaches puberty before or after their friends. It's completely normal for puberty to begin at any point from the ages of 8 to The process can take up to 4 years.
Here's an overview of the major physical changes girls can expect as they go through puberty:. 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.
Lots of girls and guys worry about when their bodies will develop. Guys wonder when their voices will get deeper, when they'll need to shave, or when their penises will grow. Girls want to know when their breasts will develop or when they'll get their first period. If a friend or a younger brother or sister develops first, they may worry that there's something wrong with them. The fact is that physical development starts at different times and progresses at different rates in different people.
Is this normal? There's a wide range considered "normal" regarding when puberty starts and how fast it progresses. For girls, puberty generally starts sometime between 8 and 13 years of age.