The puppy is going to do this for a while. It's whining - perhaps it's hungry or just needs to be cuddled. Give it lots of attention - petting and playing, etc. Start potty-training right away. Make sure it has the proper food (puppy) and water. Other than that, the whining should subside in a few weeks. And if it sounds like the puppy is whining in pain, then bring it to a vet (because 6 weeks is very young to get a puppy). Enjoy the new little life!