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  My last litter of puppies I had two little ones also ( a litter of 6 )  and it seemed that they were not gaining as quickly as the others, so I would go in every few hours and push some of the bigger puppies out of the way to allow them to nurse.  After a few days of this I was able to let them be at night, but continued to help out during the day.  They are both doing well now at 7 weeks.
 Good luck and I Hope he improves....
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