3 little puppies,?

I have three little puppies, they are perfectly. My concern is that one of the puppies is smaller compared to the other two. Is it because she was born the smallest?? I also see them twitching, i know that thats natural but what is the meaning of newborn pups( about a week old) twitching?? How old can i say that... show more I have three little puppies, they are perfectly. My concern is that one of the puppies is smaller compared to the other two. Is it because she was born the smallest?? I also see them twitching, i know that thats natural but what is the meaning of newborn pups( about a week old) twitching?? How old can i say that they are not going to die??
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