I feed my older girls and boys greens occasionally and wondered if I put some spinach or mustard, collards or turnip greens in with my week old newbies could they eat that or should we just stick with crumble?
They need grit before they get greens. Toss a clump of dirt in the brooder, it will keep them entertained, they will pick out any grit or bugs, and it starts innoculating their immune system.
I have been sprinkling grit in since they were just a few days old, and a few greens here and there. They are 5ish weeks old now, out in the coop (in their own wire crates), with grit sprinkled a couple of times a week. I give a morning feed, afternoon greens, evening feed, nighttime scratch or greens or fruit/veg. That way, they have something to scratch around for in the early am until I get out there with feed.
Keep them on a high protein diet. They are in the developmental stage of their lives. Starter crumble is loaded with protein and nutrients beneficial for optimum growth/development & health. They have plenty of time later to eat the green stuff. Right now the green stuff will full up their tummies and they won't eat as much starter.