In boys, the testicles and the penis get bigger first. Then hair grows in the pubic area and the armpits. A small amount of breast tissue might develop at this time. The voice becomes deeper. Last, acne and facial hair show up.
Some children can have different patterns.
Some girls develop breasts at a very young age but have no other signs of sexual development. A few children have pubic and armpit hair long before they show other signs of sexual growth. These changes in pattern usually don't mean the child has a problem, but it's a good idea to visit your doctor to find out for sure. Early puberty is sometimes called precocious or premature puberty. In most cases, early puberty is just a variation of normal puberty.