Yes; we cannot expect to rear a healthy infant unless they are all in his food.
Of what use is the fat?
It is needed for the growth of the bones, the nerves, the fat of the body, and the production of heat.
Of what use is the sugar?
It is needed for the production of heat, and to make fat in the body.
Of what use are the proteids?
They are needed for the growth of the cells of the body, such as those of the blood, the various organs, and the muscles.
Of what use are the salts?
Particularly for the growth of bone.
Of what use is the water?