rom being jerked across the street. Do not let a child walk too
soon, especially a heavy child. Bow legs and knock knees come from
standing and walking when the bones are soft.

_Exercise_--At least twice a day an 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 and diaper
removed. In cold weather leave on the stockings. 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 at will.

_Rest_--Healthy children never sleep too much. A new born baby should
sleep nine-tenths of the day. A child should have a nap during the day
until four years old, and, if possible, until seven or eight years old.
It should go to bed before six. It should have a crib or bed to itself,
placed where it will have fresh air, but protected from draughts, and
its eyes protected from direct rays of light.

_Air and Sun_--A little child is in its room so much it is very
important that fresh air and sunlight should be brought to it there.
Rooms may be well aired twice or three times a day, removing the baby to
another room while the windows are open. The child may be placed in its
crib or carriage before on open window, dressed as if for the street.
After children are three months old they may be taken out, but the sunny
part of the day should be chosen, between 10 a. m. and 3 p. m. in cold
weather. At night the windows should be partly opened, but care should
be taken that the infant does not become chilled. Be careful that sheet
and blankets do not get over a baby's head. The clothes may be pinned to
the side of the bed.

_Food and Water_--Even little babies should be given water twice a day.
The water should be boiled, cooled and kept covered. It is hardly
possible for children or older persons to drink too much water. During
hot weather a child needs more water than during cold weather.

Mother's milk is the only perfect food for an infant during the first
nine or ten months. If it is necessary to give artificial food from a
bottle, the greatest possible care must be taken. The milk used should
be the best obtainable. To obtain clean milk it is necessary that
everything that touches it be clean, sterilized when possible, and that
the cows, and men who handle the milk be healthy. In New York City all
milk is classified according to its cleanliness and butt