At birth, the circulation is chiefly in the vessels of the skin; for the liver and stomach, being feeble in action, demand less blood, and it resorts to the surface. If, therefore, an infant be exposed to cold, the blood is driven inward, by the contracting of the blood-vessels in the skin: and, the internal organs being thus over-stimulated, bowel complaints, croup, convulsions, or some other evil, ensues. This shows the sad mistake of parents, who plunge infants in cold water to strengthen their constitution; and teaches, that infants should be washed in warm water, and in a warm room. Some have constitutions strong enough to bear mismanagement in these respects; but many fail in consequence of it. Hence we see the importance of dressing infants warmly, and protecting them from exposure to a cold temperature. It is for this purpose, that mothers, now, very generally, cover the arms and necks of infants, especially in Winter. Fathers and mothers, if they were obliged to go with bare arms and necks, even in moderate weather, would often shiver with cold; and yet they have a power of constitution which would subject them to far less hazard and discomfort, than a delicate infant must experience from a similar exposure. This mode of dressing infants, with bare necks and arms, has arisen from the common impression, that they have a power of resisting cold superior to older persons. This is a mistake; for the experiments of medical men have established the fact, that the power of producing heat is least in the period of infancy. Extensive investigations have been made in France, in reference to this point. It is there required, in some districts, that every infant, at birth, be carried to the office of the _maire_, [_mayor_,] to be registered. It is found, in these districts, that the deaths of newly-born infants, are much more numerous in the cold, than in the warm, months; and that a much greater proportion of such deaths occurs among those who reside at a distance from the office of the _maire_, than among those in its vicinity. This proves, that exposure to cold has much to do with the continuance of infant life. But it is as dangerous to go to the other extreme, and keep the body too warm. The skin, when kept at too high a temperature, is relaxed and weakened by too profuse perspiration, and becomes more sensitive, and more readily affected by every change of temperature. This increases the liabilities to sudden colds; and it frequently happens, that the children, who are most carefully guarded from cold, are the ones most liable to take sudden and dangerous chills. The reason is, that, by the too great accumulation of clothing, the skin is too much excited, and the blood is withdrawn from the internal organs, thus weakening them, while the skin itself is debilitated by the same process.