Your Child’s Brain Grows to 90% of Its Adult Size by Age 5 — Here’s Why That Matters

Your Child’s Brain Grows to 90% of Its Adult Size by Age 5 — Here’s Why That Matters

Did you know that by the time your child turns five, their brain will have reached 90% of its adult size?

This incredible growth doesn’t just mean their brain is getting bigger—it means it’s forming connections at lightning speed. These early years are when children build the foundation for how they will think, learn, feel, and interact with the world for the rest of their lives.