Thanks Kamal, i have found some useful information on the site.
Thanks Dinkar, I thought so too and contacted the breeder and he said that most of the breeders in India dont keep puppies more than 30 or 35 days old because this is the time when they start to wean from their mothers. This is Illegal in most countries but not in India. (I'm not sure how true this is). Anyways I took him to the vet who got him mildly de-wormed. I am feeding him 4 times a day (3 times cerelac and once ecunaba.) The vet too mentioned that 5 weeks old is too young but if you take good care of him, he will be fine. He is also on Digyton and Canvitol as recommended by the vet.
Toto is too early in potty training but I have newspapers spread all around his bed and he relieves on them. However, there are many accidents. He will be 6 weeks this sunday and I am planning to start on the potty training with a little vigour. If you have any suggestions, please let me know. I am keen on making this a pleasurable experience for toto and us.