at 4 weeks old they arte old enough as mom taught them how to be chickens. I've had them set free as young as 3.5 weeks and they are now fine smart adult chickensMy poor broody mom is so thin. She has 11 babies she is taking care of and is doing such a good job, that she is neglecting herself. The other mom abandoned her chicks last week, way too early as they are only 4 weeks. I see her eating, well calling her chicks to eat, maybe she is watching them too much, instead of eating.