A survey of X chromatin in the newborn.
Buccal smears were analyzed for X chromatin in 1,000 newborn infants. The mean percentage of X chromatin in the 506 female infants was 39.5 (range 19-61) and in the 494 males 0.13 (range 0-3.0). Evaluation of the data comparing the percentage of X chromatin with caucasian and noncaucasian infants, the weight of the newborn, and the gestation time, indicated no significant differences within the male or female populations. A longitudinal study on 25 female infants for the first 4 days postpartum indicated a significant increase in the percentage of X chromatin in females.
D001724:Birth Weight; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012728:Sex Chromatin; D012730:Sex Chromosomes; D012737:Sex Factors; D044465:White People