I think it would be best you go see a Dr first and get their advice first, a paeditrician specialist would be better. To rule out hereditary conditions that might cause it

My advice is go for a proper diagnosis first with a certified medical practitioners, and they will advice your on the treatment choice available which would most probably include physiotherapy sessions. On how, what & where you decide to the the treatment is ultimately your choice.

If you are concerned on cost you can go to Klinik Kesihatan that have Klinik Ibu dan Anak & get the diagnosis from them whether it would need specialist attention or not. But for this option depending on where you live would definitely take much longer and involving a lot of steps & procedure, however you would spend very little money just that it will take a lot of your time.

As I think your child is still growing some stuff treated early may prevent further deformation of the bone structure. And getting advice on actual real treatments from someone qualified would be the best choice in the long run. Heck even going to your GP clinic and get and Xray is already a good start.