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The bigger their run or free-range area the quicker they can integrate. I added 4 "babies" when the babies were 8 weeks old.
I first let the younger ones out in the yard, enclosed in a small tractor for about a week during the day.
I then moved the brooder into the coop - the babies would free-range with the flock - and I put them in the brooder in the coop at night - with in a couple of days - I cut a hole into the brooder, that only the babies and bantams could fit through - (I have 18 total chickens 4 are bantams).
I added a small fenced off area in the run so the babies could run in but the big chickens couldn't. Most days the run is OPEN anyway - but just to be safe, they had the area in the run to hide, and the area in the coop (brooder) to hide.
There wasn't much "fighting" between them - the babies could run away, they got bullied a little bit but not too bad.
Point is - if you can free-range them, within a large area, there shouldn't bee much fighting going on.
You DO need to quarantine the new chickens, I'm not sure of the recomended time, but during the quarantine they should not have contact at ALL with your chickens.