A 19-year-old girl's brain is same as that of a newborn. What to do?

Hello doctor,

Your sister has developmental delay and predominant speech delay the cause of which could not be identifiable unless we go deep into history. How was her birth? Was she born under normal delivery? Her birth weight, how long she was in the hospital at the time of birth? Is she able to walk and recognize all? To look more details, MR brain is needed, but unfortunately, nothing could make her normal. But with physical therapy and speech therapy, she might improve. The probable cause may be possible anoxia at birth. Investigation to be done is magnetic resonance (MR) brain. The differential diagnosis is idiopathic. The probable diagnosis is developmental delay. Treatment plan include speech therapy and physiotherapy. Preventive measure to be assessed by rehabilitation team.