Weigh the pups daily, if they are gaining steadily, they are getting enough to eat. Check for dehydration. But, as other's stated if they aren't crying and they are sleeping, gaining, they're content.
Remember mom's milk only lets down every 2 hours. Your pups are a bit older now and stronger in their sucking, it doesn't require much to empty mom out.
Also, at about the 5th week, pup's milk teeth start to come in, mom will be more reluctant to allow them to nurse. Another thing to keep in mind is the consistency of her milk begins to change (not as rich), so, this is a good age to "begin" the weaning process.
__________________ Mardelin Yorkshire Terriers |