
Hi - Having had probably more C.Sections with my girls than I should have, I can tell you the milk always came in and provided enough for the newborns without my having to bottle or tube-feed. Even with a really bad situation, delayed 'Section and so on, I got them all home and onto mum to the point when the locum called that evening to make sure all was well, she was amazed to find them all latched on and happily nursing. Mind you of the original 9, we only had 4 survivors so not quite the situation, sadly I have to say, you have with your big brood. But fact is newborn puppies shouldn't need lashings of milk even if the crying because they are not getting enough (?) is of concern. They do need the first milk, and the very act of nursing should stimulate lactation. And you can keep newborn puppies going with a glucose/water solution too.
On another happier whelping, but still a C.Section, the 9 puppies in that litter all latched onto mum, who managed to walk out of the office but zonked out in the car during the 10 min. trip home to the point I had to carry a 'dead weight' from the car, on sheet ice (Christmas Eve in Canada) to the whelping box. Actually it was good that she offered no resistence to my attaching her puppies as they could get on with nursing without worrying her.
Are the puppies warm enough because they do need to be kept at around 80F in the bottom of the box - two things that produce crying would be too chilly and lack of milk. But I'm sure you have that under control and so hopefully after a brief delay from the C.Section, the nursing should bring the milk in. I'd have a supply of Whelpie or other bitch replacer milk (or even goats milk) on hand, just in case.
Good luck.