Children's brains have a massive growth spurt when they're very young. By the time they're 6, their brains are already about 90-95% of adult size. The early years are a critical time for brain development, but the brain still needs a lot of remodelling before it can function as an adult brain.

This brain remodelling happens intensively during adolescence, continuing until your child is in their mid-20s. Brain change depends on age, experience and hormonal changes in puberty.