Here's a good site - I started you on the link from Birth to 3 weeks, but if you read it and scroll all the way down, it has links for 4 weeks, 5 weeks, 6 weeks, etc.
I don't know if this particular site tells you about buying an infant onesie for your Mommy after the pups are eating well so she can still socialize with the pups, but they aren't able to nurse continuously.
http://www.dogbreedinfo.com/whelpingphotos3.htm