Newborn pups cry for 1 of 3 reasons, they are hungry, they are cold, or there is something wrong with them inside. You should be weighing them everyday to make sure they are getting enough to eat. A pup will gain weight everyday, if it doesn't, it isn't eatting enough. How much depends on the breed, but can be anywhere from half an ounce to several ounces, again depending on breed. Any pup that doesn't gain weight 2 days in a row is on the verge of being in trouble and you need to supplement the milk supply, talk to your vet about how, with what, how much, and how often.
Puppies need to be in a room that is at least 78 degrees, closer to 80 the better. If they get too cold, they will die.
If you are sure they are getting enough to eat, and are warm, it's time to take them to the vet, as they should not be crying and whining non-stop, only when they are looking for food, and then after finding it, should be quiet and happy again.
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