my son height is 78 cm, compared WHO it is less, is their any problem on his height? present his age is 22 months

A. Mam WHO standard is a general thing it is not applicable for every single single child because every child has its own genetics statistics on that basis the height is the health is the growth is there so this seems alright for the age of your child your child is 2 1/2+ right now which is good enough