What Happens in Puberty?
Puberty is when a child's body matures into an adult body capable of reproduction.
Hormones kicking in – Growth hormone, sex hormones (estrogen, testosterone), and thyroid hormone all work together.
Rapid bone growth – Long bones in the arms and legs lengthen quickly.
Body changes – Girls develop breasts and start periods; boys develop larger muscles, deeper voices, and facial hair.
The Growth Spurt
Growth spurts during puberty are dramatic and rapid.
Girls usually grow fastest between ages 10–12, often gaining 8–12 cm per year.
Boys peak a little later, around 12–14 years, with spurts of 10–14 cm per year.
After puberty, growth slows and eventually stops once the growth plates in bones close.
Early or Late Puberty
Timing of puberty varies significantly between children.
Early puberty (before 8 in girls, before 9 in boys) may cause a child to be tall early but shorter as an adult, since growth ends sooner.
Delayed puberty (after 13 in girls, 14 in boys) might mean slower growth for a while, but many children eventually "catch up."
When to Seek Advice
Parents should check with a doctor if:
Puberty starts very early or very late.
A child's height or growth pattern changes suddenly.
There are concerns about weight gain, acne, or emotional changes being too severe.
The Key Takeaway
Puberty is a normal — and sometimes surprising — phase of growth. While timing differs for every child, what matters most is that growth follows a healthy pattern.
Supporting your child with good nutrition, regular exercise, enough sleep, and emotional reassurance makes the journey smoother.