my nine months baby boy was sitting on the floor and suddenly falling on. mat when he was sitting he continues sitting for 15/20 min independently but after that he can not control and fall down and than cry is it normal ???

A. By this age a child can learn to sit independently by the age of 8-8.5 months so that’s ok as of now so give it some more time I’m sure the child would learn to sit for a longer duration and if needed then u should consult your doc