if the mother is still around and is able to give the kittens milk then dont stop her. supplement milk is no where near as good as mother's milk. it doesnt have the nutrients the kittens need to survive and keep strong. but if you have new borns which dont have a mother or the mother is unable to provide milk then as the vet for help and supplement milk is the only answer.
Kittens can go outside. If they are born outside, then they'll be perfectly used to it out there. Kittens like to roam around, explore and play with each other. Although, it is probably wise to keep a very young kitten inside the house or a barn because of the many dangers outdoors, and then you could help it adjust to being outside as it gets older.
Omie Wise was born in 1789.
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