My daughter is 6 years old. What size...
My daughter is 6 years old. What size helmet should I buy?.
Measure her head and go this sizing; Small: 49 - 51cm, Medium: 51 - 53cm, and Large: 53 - 55cm. The great thing about the Avid is that it has a size adjustment in the back. So my daughter who is 2 1/2 wears a small, because I can adjust it small enough for her. Use the sizing as a solid reference.