Examine a newborn-cohort study linking prenatal hormone indicators in finger-length patterns to male neonatal head circumference and implications for brain evolution.
Key Takeaways
- Researchers measured 2D:4D digit ratios in 225 newborns and analyzed associations with head circumference
- Higher-estrogen-associated digit patterns correlated with larger head circumference in male newborns
- No similar association between digit ratios and head circumference was observed in female newborns