Kathryn, depends on the location how you register. Find a location here:
Find a Location
I'm so excited that I live close enough to one to participate this year! I have no idea what diaper Aiden will be wearing since we will be traveling over an hour there. I'll either change him into a Bitti Tutto or a Blueberry. He'll probably be wearing a romper so I don't have to completely undress him and it'll be warm here.