Charleejane99, please don't feed puppy formula!!! Puppies need colostrum, which is only produced by the bitch for the first 24-ish hours after whelping. Colostrum gives them antibodies to all diseases the bitch has been vaccinated against, as well as further antibodies which will result in a strong immune system throughout the life time of the puppy.
Feeding anything else will cause the gut wall to close and prevent the puppy from absorbing colostrum.
Instead, if you are concerned about a small puppy at this stage, give him private nursing sessions by removing the others from mum for 15mins a couple times a day and letting him nurse as much as he needs.
I cannot believe the number of times on this board I see breeders leaping in to supplement with formula at the drop of a hat - it is horrifying. Formula milk also contains BHA, BHT and other preservatives which are known carcinogens and which most people attempt to avoid even in their adult dog's food - let alone giving it to a newborn puppy...

It's like people can't just sit back and watch the bitch raise her litter, they want to be DOING something, and if they can't see something to do, will do unnecessary (and potentially harmful) things.
THE BEST NUTRITION YOU CAN GIVE A NEWBORN PUPPY, IS ITS OWN MOTHERS MILK AND ONLY IN EMERGENCIES SHOULD YOU GIVE ANYTHING ELSE!!!!