PEDIATRICS Vol. 34 No. 3 September 1964, pp. 419-421
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Lower Incidence of Sex Chromatin in Newborn Females Delivered by Cesarean Section

THOMAS C. WEGMANN B.A.1 and DAVID W. SMITH M.D.1

1 Department of Pediatrics, University of Wisconsin Medical School, Madison 6, Wisconsin

The previously reported low incidence of sex chromatin in buccal cells of newborn females has been confirmed in babies born by cesarean section. However, there was no comparable change in sex chromatin percentage for their mothers as had been reported for vaginally delivered women. Further studies on vaginally delivered mothers raised some doubt as to the validity of the previous maternal results.