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I have a mixed flock too. I've heard others talk about something called "flock raiser" which is a general feed suited to a situation like yours. You might look for that. I also have used something called "all-purpose" before, which I believe is similar.
But I would also like to say that I have raised young birds from maybe 8 weeks or so with the rest of the flock on layer feed before--no harm done. I've also fed it to baby chicks, at least short term, when I ran out of starter. I'm not sure why some people make all this hullabaloo about the "hazards" of feeding young birds layer and so forth. Just from looking at the nutritional information on the bags of feed, I've observed that all of these single-purpose feed mixes are remarkably similar in their makeup. When I thought about that, along with the fact that about a third of what my flock eats is random scraps, moldy bread, vegetables, azolla, insects etc., etc. (as well as the fact that throughout most of history chickens were raised on a few handfuls of surplus grain and some garbage, plus whatever they could scrounge up on their own), I started doubting how important those tiny differences in the numbers really are... As a result, I've started worrying about it less and less. And I don't see the point in making other people worry overmuch about it either.
I privately suspect much of this is a marketing gimick--the same people are the ones who will tell you that you should never raise chickens of different ages together in the first place, OR ELSE. Much of what you hear or read has little bearing on home flocks--but if people make you think that raising chickens is more complicated than it is, then they can sell you more stuff.
If the babies need some extra protein, for example, I give them a piece of spoiled cheese or leftover fish once in a while, or I kick over a rotten log so they can eat some bugs. I have yet to see any ill effects from my "carelessness" in this regard...
You will hear wildly varying opinions on this, I'm sure--but this is my personal experience and opinions formed thereof...
Good luck with your motley chicken family!