We have 4 baby chicks that are two weeks old (Black Sex Links). Brought them home from Tractor Supply to add to our flock. We have 5 adult Black Sex Links already and 6 adult Buff Orpingtons. The adults are free range in a 2 acre pasture. We coop them at night within a stall within a run-in barn. The babies are within a 2 foot wide, 4 foot long wooden enclosure within the stall. The babies have a heat lamp and a brooder plate. Believe the babies have mites. They’re losing their feathers around their throats and wings. They appear itchy (working under their wings with their beaks, some rolling like the adult girls do in their dust bath in the pasture). Adult hens appear fine. Mites? Advice? Treatment? Help!