My bitch is due hers pups this week, I was told to buy nutri-drops for her and pups when born but not exactly sure how and when to use them, anyone used them before and can advise me? Thanks

nutridrops give Mum a boost  if she has a long labour , you can also use them on a pup that is slow in suckling , gives a quick boost of nutrients for energy handy to have in your whelping pack but not always required.
I have used them twice with excellent results.

Good luck with your litter.