Much interest has recently been awakened in a study of infant mortality during the early weeks. The importance of such a study is evident for several reasons. According to the best recent statistics available, one-third of the deaths of the first year occur in the first month of life, and seven-eighths of these come in the first two weeks. Using our own statistics to supplement these, of 100 infant deaths during the first year, approximately 33 occur in the first month 28 occur in the first two weeks 22 occur in the first week 13 occur on the first day This is a concrete statement of the problem of infant mortality from one point of view. While the campaign for the reduction of infant mortality has greatly lowered the deaths from diarrheal and nutritional diseases and has made some considerable impression on respiratory and contagious diseases, thus far it can