Thanks Anjana, this
www.kids.scintro.com looks to be a very useful site.
My son speaks few words in 3 languages now. Actually I have not been able to teach him anything as I am a working woman. He has just learnt by observing us speak to him.
I have shown him flash cards of Alphabets, but that also only twice. I had purchased some small book of Animals - Domestic and wild, fruits and vegetables, colours and shapes, vehicles etc. My mother-in-law has shown him all these books and now he is able to say words like container, tractor, bufallo, rhinoceros etc. However shapes and colours are yet to be thought. He is picking up words and keeps repeating anything we talk.