All of our kid's and adult hats are snapbacks so they are adjustable. However, we highly recommend measuring your child’s head before making a purchase. To measure the circumference of your child's head, start with the tape measure above the ear and then graze the forehead where you want the brim to sit. These snapback hat's for babies, toddlers, and kids have been meticulously designed to fit your little one as best as possible. Every aspect of our trucker hats and sun caps has been carefully thought out and designed.