I would get a second opinion too, maybe if only to have more of your questions answered.. When my daughter was born, the Paed told me she had a clicky hip and that it might require treatment, but that i need to have an ultrasound first to see if the hip is out of place or not. I was told they usually dont start treamnt for it without having an xray or ultrasound first?
I hope you can have your questions answered and that your son is ok.