
Mine always from almost day 1 have between 4 and 6 times their normal rations (depends on size of litter) but it's basically ad lib, if the bowl is empty then it gets filled, and other stuff is extra.
At 4 weeks if Mum getting plump and pups eating a lot, I cut down a little, once she starts rationing milk bar privileges then I cut again, so by 6 weeks she is eating double her rations, and if lean will stay on that until her coat is gone, and if plump then will stay on 1 1/2 times normal diet until the coat starts returning.
I found in the past if I cut them down to trim weight too fast they lost condition when they dropped theri coats..