Seeking Pediatric Autism Consultation in Chennai – Recommendations Needed

I live in Japan, and I have a 4.5-month-old daughter who is showing signs of autism. However, the doctors here have told me to wait for two more years to see if her condition improves before taking any action. I would like to get a second opinion from a pediatric specialist as soon as possible. Some of my Indian colleagues recommended Chennai as the best place in India for pediatric care, especially for developmental concerns. I am considering traveling there for a consultation, but I need recommendations for: 1. Good pediatric hospitals or specialists in Chennai who have experience with early signs of autism. 2. How to get an appointment – is it possible to book online, or do I need to visit in person? Any advice on the process, costs, or what to expect would be greatly appreciated. Thank you in advance!