I just went through the same thing with my 15 month old. I actually found one at KMart that fit her. It is a toddler size. I am only riding in my local park and around my neighborhood, which has no traffic, so it is not like I needed to protect her from any "extreme" falls, like could occur while riding in traffic. The helmet needed a little adjusting, but it fits. Another thingyou could do, but it would be a little more expensive is take her to a local bike shop and they will have a helmet to fit her or be able to tell where to look for one. good Luck and Have fun!!!