Many of these children have never had a purgative in their lives, and the maternal pride when weaning brings three motions a day is gratifying if amusing. Often the crying of a slightly underfed baby us attributed to the infrequency of the bowel evacuation; purgation follows, and depletes it still further. In an effort to retain its fluids the body extracts more water from the intestine, and true constipation result, and is followed by further purgation.