I bought my 6 year old son a set of riding gear including helmet, gloves and jacket. I had a hard time determining what sizes to buy since no place around carries this stuff in stock. He is slightly on the tall side for his age. I measured his head and got a reading of 54cm. That translates to adult XS or childs large. I opted for the adult XS. The jacket was a 1/2 price close out and was somewhat of a guess for sizing. It is size child's small or size 7. It fits him very well. The sleeves are just slightly long. For gloves I ordered him some women's XS. They fit okay across the width of the hand but the fingers are a bit long. I got great prices on everything from motorcycle-superstore.com. I'm posting this to hopefully help someone else in the same situation of trying to find riding gear for a child. We don't ride a lot or very far but I wanted him to have decent gear.