The paranasal sinuses in infancy and childhood have been of interest to the medical profession for many years. The embryology and development of the sinuses have been investigated and reported completely. Sinus infection in children and its relationship to general health, pulmonary disease and growth of the sinuses have been the subject of numerous reports. Most of the literature has dealt with anatomic material and with patients seen in clinics and in practice. There have been few reports on the sinuses of normal children.
For many years the Child Research Council has been collecting data on a group of healthy children. As part of that program, routine roentgenograms of the sinuses and of the chest have been taken, physical examinations recorded and the interval history noted periodically from the time the child is born. Since each child is examined at approximately three month intervals, a large amount of material is