Childrens Snapback:

Infant/Toddler- Adjustable Infant Snapback. 15-19 INCHES. Fits Extra Small, XXX-Small. 

Typically Fits up to 2.5 years old. 

Youth-Adjustable Youth Snapback 18-24 INCHES. Fits SIZE 6-7 1/8.

Typically fits 2.5 years and older.

Children's Beanies: 

The "Infant/Toddler" beanie fits up to a 3 year old (typically) 

The "Adult Beanie" Will fit over 3 years and up (typically)