Most puppies when moved to a strange place, cry for the first week or two. It is completely normal and it is because they are frightened, they do not understand where their littermates went or where their mother is. They basically want attention and many new dog owners become worried that the dog is just not happy with them. The best way to sort the problem out is to ignore it. It can be hard to do because it is the same as hearing a baby crying for help and not going to help them. It tugs on the heart strings and it is difficult to ignore.
However, if you do ignore the problem then the puppy will eventually realise that crying does not help and that they will still see you in the morning. Some puppies do not cry at all, others cry for a few nights, whilst some simply will not give up for a week or two. So, just persevere and you will notice that the problem does go away, just as long as you do not give the puppy any attention whilst it is moaning.
However, if you do ignore the problem then the puppy will eventually realise that crying does not help and that they will still see you in the morning. Some puppies do not cry at all, others cry for a few nights, whilst some simply will not give up for a week or two. So, just persevere and you will notice that the problem does go away, just as long as you do not give the puppy any attention whilst it is moaning.