He learns when and how long he is expected to sleep, when and how much to eat; he very soon finds out the peculiar touch and vocal tones of this person or that, and acts upon these distinctions.

He gets to know the meaning of his food bottle, to understand the routine movements of persons about the room, and the results of violations of their order.

His hat, wraps, carriage, become in the first half year signals to him of the outdoor excursion.

He no longer bobs his head about when held erect, and begins to control his natural processes.

The remarkable thing about all these adaptations is that they occur before the infant can in any sense be said to have a Will; for, as has been said, the fibres of the brain necessary to voluntary action--in the cortex of the hemispheres--are not yet formed.
The realization of this extraordinary adaptiveness of the very young child should save parents many an anxious day and sleepless night.
There is practically nothing more easy than to impress upon the child whatever habits of daily--and nightly!--routine one wishes to give him, if he be taken early enough.