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?