Blount's Disease in a 2 year old toddler boy?

My son has been diagnosed with Blount's Diseases after having xrays done for both of his legs last year. We initially thought he just was severely bowlegged but found out that we had to see an orthopedic. We seen an orthopedic who advised us an official diagnoses can not be made until the age of 2 and until them we wait and see. The doctor was extremely rude, short, and unhelpful with any questions we had. This disease is rare and often misdiagnosed for being bowlegged. I did some research on my own and gathered as much info as I could but still feel very uneducated about this disease. I read that kids can not be diagnosed until 3 but am not too sure if this is correct. Our Son will be 2 in July and I refuse to go back to this quack of a doc but until November Im stuck with my current insurance which allows me to see only one orthopedic, HIM! PLEASE tell me what age kids can be officially diagnosed? Is it something that is only getting worse as we wait or is this info provided by the doc correct? Is there things we can do on our end to possibly make the bowing of his legs better? Please help us. If you have a child who has this your info would be greatly appreciated. Thank you