One thing to keep in mind for those who incubate/brooder raise chicks: around the 11th day of life, broody raised chicks will begin voluntarily going out of sight of their mother. As it turns out, they're going through a very important milestone in their cognitive development. Research shows that this is the time where they're beginning to develop their ability to orient themselves in their environment. These "occlusion experiences" where they must navigate to something they cannot see (their mother) really improves their spatial awareness later in life, and chicks that miss this window tend to make wrong turns and become lost more easily as adults. If you're raising chicks in a brooder, you can make sure your chicks have these experiences by placing objects that block their view in the brooder--curtains, hiding places, tunnels, whatever--before the 11 day mark. If the chicks have the opportunity, they will explore these areas, which develops their navigational "software" and really helps them as adults. You do need to have a big enough brooder for this to work, but there is real, scientifically measurable benefit to doing this.
Work cited:
Freire, Rafael, et al. “Development of Spatial Memory in Occlusion-Experienced Domestic Chicks.”
Animal Behaviour, vol. 67, no. 1, Jan. 2004, pp. 141–150,
https://doi.org/10.1016/j.anbehav.2003.03.015.
Edit: typo