Abstract
The importance of fetal cephalometry in utero becomes obvious when one considers the problems of suspected or real disproportion between the fetal head and the mother's pelvis. Although it is possible by means of roentgen and other methods of pelvimetry to perform satisfactory mensuration of the maternal pelvis, it is universally conceded that at the present time a knowledge of the correct estimation of certain important diameters of the fetal head in utero is not available. In the present article a method is described which has proved satisfactory in my hands for measuring the occipitofrontal diameter in utero and a report is made of a statistical study of unmolded heads of new-born infants, in order to establish the relationship of the occipitofrontal diameter to other important cephalic measurements. The accompanying data are taken from the records of 149 infants delivered in the obstetric service of the Woman's Clinic of the

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