pup weight

Question
The pup I am geting was 125 gms at birth and by two weeks it was 390gms.  Is this ok?  It was the only one of three to survive and I am worried it will not be properly socialised.  Should I worry?

Answer
Yes that is a fine weight.  That is 13 or so ounces.  No as long as the breeder properly socializes the puppy.  Whether it has sisters or brothers wont make that much difference.  What makes the difference is the work the breeder does to socialize the puppy in those all important first 8 weeks.