Rear wheel is worn down after 4 months

I love most things about this scooter. It’s pretty much ready to use right out of the box. Assembly is very simple and only takes a couple minutes. My four year old received it for Christmas and has been using it inside for the past few months due to bad weather. He has only used it outside twice when we noticed that the rear wheel has been so worn down that it is no longer round. I’m not sure if the wear is due to riding the scooter or applying the brake. Either way I am disappointed that this scooter may not last through the spring.

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