[Sex chromatin frequency and hormonal crisis in the newborn infant].

Sex chromatin frequency was investigated in nuclei from epithelial cells of the oral mucosa in 20 healthy, mature newborn females in the first 10 days of the neonatal period and compared with the hormonal state of the infant. From the analysis of the results obtained it was evident that sex chromatin incidence of the newborn female fluctuated in the neonatal period in values similar to those of healthy, nonpregnant woman. However, a specific correlation was disclosed between the alterations of the sex chromatin frequency and the hormonal crisis of the newborn infant.