Newborn Study Finds Sex Differences in Face Preference Within Hours of Birth
A University of Cambridge study of 130 newborns found that female infants showed a stronger interest in face-like images than male infants shortly after birth. The findings, published in Biology of Sex Differences, suggest biological factors may influence early social attention. Lead researcher Yumnah Khan noted that similar sex differences have been observed prenatally in the brain.
The study builds on research from more than two decades ago, but with improved experimental methods that addressed earlier design concerns. Researchers tested newborns within hours of birth to limit environmental influence, and lead researcher Yumnah Khan noted that recent work has identified sex differences in the brain that begin prenatally, extending that observation to early behavior.
The researchers point to prenatal testosterone exposure as a possible factor, since male fetuses receive higher levels than female fetuses. The findings could inform research into developmental conditions affecting social interaction, and future studies will examine whether these early differences influence language acquisition and the differing rates of certain neurodevelopmental conditions between males and females.
This study could shape how researchers approach early social development and the biological underpinnings of conditions like autism, which affect males and females at different rates. However, the findings are preliminary and do not predict individual outcomes. Parents and educators may find the results intriguing, but should be cautious about overinterpreting sex-based differences, as environmental factors remain highly influential in shaping development.