For the very same factors, the space in which the baby sleeps must be big, and the air often restored; for absolutely nothing is so prejudicial to its health as sleeping in a heated and impure environment. The practice, for that reason, of drawing thick drapes carefully round the bed is extremely pernicious; they just address a beneficial function when they protect the baby from any draught of cold air.
The correct time for taking the baby into the open air must, of course, be figured out by the season of the year, and the state of the weather condition. The nurse-maid, too, ought to not be permitted to loiter and stick around about, hence exposing the baby needlessly, and for an unnecessary length of time; this is usually the source of all the evils which accumulate from taking the babe into the open air.