Go to NIMHANS, Bangalore. Excellent doctors.
you must go for speech therapy for your nephew. It is a good therapy for this kind of kids & also i would like to suggest you an activity, ABACUS it is a 360 brain development activity. Abacus Maths helps to develop the right brain of a child. Abacus can be helpful in the development of one€™s inner abilities like concentration, speed, memory, accuracy and learning ability.http://www.iiva.in/