Hi Babies achieve milestones at different times. Some start to walk very early some inbetween 1 year to 2. So please relax. If baby is active and having food properly then please don't worry.

First of all you ensure the diet that you given it be must healthy and baby friendly . And second thing is that consent with dr. Pediatrician or orthopedic doctor about his problem u can also give massage to baby and give them sunlight at morning time it is also helpfull.