It is doubtful if healthy children ever do. Excessive sleep is an important symptom of some diseases of the brain. Otherwise it seldom if ever occurs unless soothing sirups or other drugs have been given. EXERCISE _Is exercise important for infants?_ It is as necessary for them as for older children. _How is it obtained?_ A young baby gets its exercise by screaming, waving its arms, kicking, etc. The clothing should not be so tight as to make these movements impossible. At least twice a day the infant should be allowed for fifteen or twenty minutes the free use of its limbs by permitting it to lie upon a bed in a warm room, with all clothing except the shirt, stockings, and napkin removed. Later, when in short clothes, the baby may be put upon a thick blanket or quilt laid upon the floor, and be allowed to tumble about at will. A nursery fence two feet high, made to surround a mattress, is an excellent device and makes a convenient box stall for the young animal, where it can learn to use both its arms and legs without the danger of injury. Only by exercise such as this do the muscles have an opportunity to develop properly. THE CRY _When is crying useful?_ In the newly born infant the cry expands the lungs, and it is necessary that it should be repeated for a few minutes every day in order to keep them well expanded. _How much crying is normal for a very young baby?_ From fifteen to thirty minutes a day is not too much. _What is the nature of this cry?_ It is loud and strong. Infants get red in the face with it; in fact, it is a scream. This is necessary for health. It is the baby's exercise. _When is a cry abnormal?_ When it is too long or too frequent. The abnormal cry is rarely strong, often it is a moaning or a worrying cry, sometimes only a feeble whine. _What are the causes of such crying?_ Pain, temper, hunger, illness, and habit. _What is the cry of pain?_ It is usually strong and sharp, but not generally continuous. It is accompanied by contraction of the features, drawing up of the legs, and other symptoms of distress. _What is the cry of hunger?_ It is usually a continuous, fretful cry, rarely strong and lusty. _What is the cry of temper?_ It is loud and strong and accompanied by kicking or stiffening of the body, and is usually violent. _What is the cry of illness?_ There is usually more of fretfulness and moaning than real crying, although crying is excited by very slight causes. _What is the cry of indulgence or from habit?_ This is often heard even in very young infants, who cry to be rocked, to be carried about, sometimes for a light in the room, for a bottle to suck, or for the continuance of any other bad habit which has been acquired. _How can we be sure that a child is crying to be indulged?_ If it stops immediately when it gets what it wants, and cries when it is withdrawn or withheld. _What should be done if a baby cries at night?_