Summary
The frequency of Y chromatin, visualized as fluorescent bodies in cell nuclei from lymphocytes in blood smears, was signficantly less in newborn males than in three-month-old male infants and adults. The frequency of Y chromatin-positive cells on day 0 was 36.16±9.11% and then increased daily. At one month after birth the frequency was 55.07±9.29%, which was not significantly different from that in adult males (57.08±5.97%).
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Iijima, K., Higurashi, M. & Hirayama, M. The transition in frequency of Y chromatin in males during the neonatal period. Hum Genet 42, 241–243 (1978). https://doi.org/10.1007/BF00291302
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DOI: https://doi.org/10.1007/BF00291302