How often should you give a 5 week old puppy de-wormer?

It should still be with its mum. It may have personality problems when it's older if it is removed from her too early. If you must remove it from it's mother, then bottle feed it every two to four...

They should eat atleast 3 times a day. 2cups of food each time.

No, the mother will provide them with milk, but you should provide the mother with plenty of fresh water, so that she can continue to produce milk for her pups. If the mother refuses to nurse, or she...

Wait until it is 3-5 months old and probably bathe it every 3 weeks.

Probably about twice a fortnight, or if he is smelly. Use a dog shampoo and conditioner and make sure it doesn't come in contact with his eyes, or get in his ears.