S.B.
Please, definitely follow the medical recommendations.
I have step-family members who waited too long and thought it was just something their son would "grow out of". He ended up having to have surgeries, then the casting, then the PT. It was an ordeal.
Their younger daughter had the same condition and you'd think after everything with their son that they would have intervened earlier. But, they didn't.
It's got to be easier on the kid to deal with it earlier. I've only seen what happens if you don't.
Best wishes.