This section is from the book "The American Woman's Cook Book", by Ruth Berolzheimer. Also available from Amazon: The Domestic Arts Edition of the American Woman's Cook Book.
Ordinarily, do not try to serve flesh foods (meat, fish, and poultry) more than once a day. Milk, eggs, and cheese supply a desirable quality of protein or muscle-building foods and may be served instead of meat. The more milk one has, the less meat he needs. Peas, beans and cereals can not replace the high-quality protein found in meat, eggs, milk and cheese, but they have great value in supplementing the animal proteins. If they are used instead of meat, some milk, eggs or cheese should be included in the meal. The weekly allowance of meat foods need not be higher than one and three-quarters pounds for each person in the family, in order to furnish appetizing meals. This means an average daily portion of not more than a quarter of a pound.
A child under four or five years of age is well off without any meat at all. If he has an egg every day in addition to his three-fourths of a quart or quart of milk allowance, he will get adequate protein food.
A child four or five years old may have a little meat-food in addition to his milk allowance. He should have no more than a small serving (an ounce or less) each day of lean beef, mutton, lamb, chicken, lean fish or oysters.