My little guy is almost 2. He loves to ride the sled with me, he is trying to stand on the seat of his electric 4-wheeler while he is riding it. It got me to thinking about a helmet for him. What age have some of you put your kids in helmets. We were a shop the other day and I put a youth small on him, it was big but he could hold his head up, and I thought I could put one of stocking hats underneath it if I had to. What do you all think.