
I would not supplement with the Vitamin D and calcium unless the bitch was diagnosed with a deficiency. By giving the supplement it can stop the body rallying it's own resources as it should.
I do give goats milk puppy milk about half a pint in the first few days unless bitch is too loose.
Mine are on ad-lib (probably about 4 times their normal rations) from the word go.
As to what I do post whelping, stick matchsticks in the eyelids and watch Mum and pups like a hawk.