I know of two schools of repute, which give special attention to young children, who may be different or have a problem.
One school is NAVADISHA located in Velacheri and run by Ms. Rukmini Ramamchandran.
The other school is HEADSTART located in Kottivakkam (beyond Thiruvanmiyur, on the East Coast Road). It is run by Ms. Sudha Mahesh.
You may try to get to them on the telephone first. Please do not hesitate to state the special needs of your child.