Puppies and their mother
Puppies are one of life's amazing treats. Everyone loves the cuteness that puppies bring to the world. But it's important to remember that puppies are like babies, and they whine and climb out of their nest for a reason.
It's a difficult time for new born puppies and their mother. The mother is now responsible for looking after her puppies, which can be a stressful time, and this could be a possible reason for any out of character behaviour.
Back onto the puppies
Think about a human baby. The only way a baby can communicate is by crying (or making strange noises!) as they can't talk. Puppies whine at their mother for the very same reason. They haven't learned how to bark properly yet, and whining is a great way for them to tell their mother that they're hungry or cold or in need of some form of attention.
When to worry
Whining is a perfectly normal thing for a puppy to do. As long as the mother is treating them well then they should be fine. If you are concerned about illness, or if the mother doesn't seem to be caring for the puppies, then it's important to get in touch with a vet to check that everything is okay.
It's also important to remember that you're responsible, too. Make sure the mother is as happy as possible. Give her lots of attention and let her know she's doing a great job. Ensure that the house isn't too cold for the puppies, and most of all, spend loads of time with them having fun!
I think you should have a look at this video. It highlights the really important things to remember about your puppies and their mother as she takes care of them - food, warmth, care, etc.