Digit ratio (2D: 4D) in newborns: influences of prenatal testosterone and maternal environment
INTRODUCTION: The 2D: 4D digit ratio is sexually-dimorphic, probably due to testosterone
action through the perinatal period. We characterize the 2D: 4D ratio in newborn (NB)
infants, in between the pre-and postnatal surges of testosterone, and relate it to the mother's
2D: 4D and to testosterone levels in the amniotic fluid (AF). SUBJECTS AND METHODS:
Testosterone was assayed in samples of maternal plasma and AF collected at
amniocentesis. Shortly after birth, 106 NBs and their mothers were measured for 2D: 4D …
action through the perinatal period. We characterize the 2D: 4D ratio in newborn (NB)
infants, in between the pre-and postnatal surges of testosterone, and relate it to the mother's
2D: 4D and to testosterone levels in the amniotic fluid (AF). SUBJECTS AND METHODS:
Testosterone was assayed in samples of maternal plasma and AF collected at
amniocentesis. Shortly after birth, 106 NBs and their mothers were measured for 2D: 4D …
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