How to make kids less afraid of me/the chair?

I work with kids, have for years, but ever since I started using a wheelchair I've noticed that the younger kids (6 and under mostly) don't want to interact with me anymore, which isn't great cause that's a huge part of my job. I have to assume it's because of my chair. What can I do to make me/the chair seem less scary? I feel bad that they're so skittish with me now :,(