Little Nutty for Little Kids! These little safety gear for kids are sure to get your kid out on their Hoverboard, Bike, or whatever sport be in safety and style. Little Nutty comes in a single size, XS, and generally fits children aged 2 to about 6 or 7 years old. Little Nutty for Little Kids! Little Nutty is sure to get your kid out on their Hoverboard, Bike, or whatever sport be in safety and style. Little Nutty comes in a single size, XS, and generally fits children aged 2 to about 6 or 7 years old.