Hi I think my child is bow-legged. Is there any ways to certify that or what do I need to do about it?

I remember my bro have bow leg when he is small n my dad ask him to put ur legs n foot straight.. ask him to do sit-ups .. n some more exercises.. wear shoes m check with ped as soon as possible when u have doubt to rectify the posture .. my bro now normal legs .. the exercises all helped him