What is the procedure for getting dual citizenship for kid born in US for Indian parents?

Hi,
Myself and my wife came to US in H1 visa for work purpose and we had a kid here. Now the kid holds US citizenship, now we are planning to go back to India.
Now what are all the options that I have for my kid.
What is the procedure if I want to change my kid to Indian citizenship?

Please provide me proper info about this.

Thanks,
Vino.