With my first, I always washed the baby clothes on their own. You go through enough to make up a load anyway. I didn't use any fancy powders etc But I have always stuck to the same one.
Second baby I washed baby clothes with Evan clothes.
Third time round I am sure it will all get chucked in with what ever is going in!

Mind you I sort the clothes pretty well anyway. So usually kids clothes in darks & lights. Mine & DH clothes in darks & lights, fleecy stuff on its own, jeans for some reason I do with towels. Then sheets etc.

I think that the Lux flakes or the ammolin is good for bubs with sentitive skin. But I have never used them.