Food for mother and pups?

[Finkie_Mom]

So I have been reading (and been told) varying opinions as to what to feed a dam after whelp/what to introduce puppies to when they are old enough. Do you feed an ALS food? Puppy? Different foods to dam and pups? What brands do you prefer?

I need to stick to kibble, and preferably nothing too difficult to get, as I would ideally be able to have puppy buyers continue with the same food. And obviously, the less expensive the better.

Thanks for any advice and recommendations you can give!