Raising baby chicks seems a comparatively simple matter to some, yet there are more failures in poultry-keeping due to inability to raise good, vigorous pullets than to any other one cause. The number of eggs produced, the size of the eggs (within certain limits), and the profit made from a flock of hens is often determined very largely by the success in brooding the chicks and developing the pullets into strong, vigorous hens. Many who try to raise chicks are not successful because they fail to realize that a baby chick is a "real baby". They cannot survive with careless treatment and neglect but must be kept warm and dry in clean, sanitary, well-ventilated brooders. They are weak, delicate orphans, but are easy to raise if a little motherly common sense is used.
Alder, Byron, "Circular No. 50 - Brooding and Feeding Chicks" (1924). UAES Circulars. Paper 45.