As he's just 36 days old, I'll suggest you to feed him liquified food in form of curd or puppy ceralac. You can start egg and rice after he is 2 months old. You should continue royal canine. Just take him to the Vet for regular check-ups, ensuring his vaccination and deworming schedules are up to date. Always keep plenty of water for him to drink. Keep him inside the house till he is 3 months old by which time most of his basic vaccinations will be completed and his chances of pick ingup infections from the outside will be less. Right now, please keep him under a close supervision.