Most babies are born with curved or bowed legs. This is normally a result of the way they were “packaged” in the uterus. (You can see this if you try to fold your baby back into the position that she was in while inside of you.) When your child starts walking, someplace in between 9 and 17 months, the bones in her legs will start to slowly reform as old bone breaks down and is changed by new bone in various places where it’s now needed to support her weight. Typically within six to nine months of starting to walk, your child will have straighter legs.
Also read: What cause bow legs