I'm not really sure that dry kibble would be the best thing for a small puppy yet? Certainly one feeding a day is way too little for a growing puppy.
I did a Google search, maybe this will help

"Until the animal is 4 to 5 weeks old, bottle-feeding is necessary."
"We recommend Esbilac for puppies.."

Care of Newborn Puppies

theres other links that popped up, just do a search on google.com for "feeding 4 week old puppy"