The bed on which the child now sleeps should be a mattress: at this age a feather bed is always injurious to children; for the body, sinking deep into the bed, is completely buried in feathers, and the unnatural degree of warmth thus produced relaxes and weakens the system, particularly the skin, and renders the child unusually susceptible to the impressions of cold. Then, instead of the bed being made up in the morning as soon as vacated, and while still saturated with the nocturnal exhalations from the body, the bed-clothes should be thrown over the backs of chairs, the mattress shaken well up, and the window thrown open for several hours, so that the apartment shall be thoroughly ventilated. It is also indispensably requisite not to allow the child to sleep with persons in bad health, or who are far advanced in life; if possible, it should sleep alone. Sect. V. BATHING AND CLEANLINESS. DURING INFANCY.--Too much attention cannot be paid to cleanliness; it is essential to the infant's health. The principal points to which especial attention must be paid by the parent for this purpose are the following:-- TEMPERATURE OF THE WATER.--At first the infant should be washed daily with warm water; and a bath every night, for the purpose of thoroughly cleaning the body, is highly necessary. To bathe a delicate infant of a few days or even weeks old in cold water with a view "to harden" the constitution (as it is called), is the most effectual way to undermine its health and entail future disease. By degrees, however, the water with which it is sponged in the morning should be made tepid, the evening bath being continued warm enough to be grateful to the feelings. A few months having passed by, the temperature of the water may be gradually lowered until cold is employed, with which it may be either sponged or even plunged into it, every morning during summer. If plunged into cold water, however, it must be kept in but a minute; for at this period, especially, the impression of cold continued for any considerable time depresses the vital energies, and prevents that healthy glow on the surface which usually follows the momentary and brief action of cold, and upon which its usefulness depends. With some children, indeed, there is such extreme delicacy and deficient reaction as to render the cold bath hazardous; no warm glow over the surface takes place when its use inevitably does harm: its effects, therefore, must be carefully watched.