Birth differences in attention prompt debate

What's happened

A Cambridge study suggests newborn girls spend more time looking at faces than newborn boys, hinting at early sex differences in attention. The results, from about 33 hours old, could reflect biological factors like prenatal hormones, but don’t establish persistence or long-term effects. Other studies offer mixed findings on birth differences and social factors.

What's behind the headline?

Brief

• The study adds to the ongoing debate about nature versus nurture in early life. It shows a small, group-level difference at birth but acknowledges wide individual variation.
• The results argue for biological plausibility (hormonal exposure in the womb) while also noting socialization could begin in the first days of life, albeit likely minimally.

What this means for readers

• Early attention patterns may not predict later behavior; differences are subtle and not universal.
• If confirmed, these findings could influence how researchers think about early markers of social development and neurodiversity, but they do not imply deterministic outcomes.

Forecast

• Further longitudinal work will determine whether these tiny early preferences persist and relate to later language or social skills.

How we got here

The Cambridge team studied 130 babies aged 8 hours to 3 days, using eye-tracking to compare attention to a caregiver’s face versus a Newton’s cradle toy. While both sexes preferred the face, girls showed a stronger bias. Prior research has shown conflicting results about birth differences, with a 2025 review reporting no clear sex differences in facial fixation or contagious crying.

Our analysis

The New York Post reports a Cambridge study finding newborn girls show a stronger preference for human faces than boys at about 33 hours old, with hormonal and socialization explanations considered. The Guardian covers a related Cambridge study and frames it as part of the debate on innate versus learned sex differences, highlighting ongoing questions about early development and neurodiversity.

Go deeper

• Do these early differences persist as children grow?
• How do researchers separate biology from early social cues in newborns?
• What are the implications for diagnosing neurodevelopmental differences in infancy?

More on these topics

• The Guardian - Newspaper

  The Guardian is a British daily newspaper. It was founded in 1821 as The Manchester Guardian, and changed its name in 1959. Along with its sister papers The Observer and The Guardian Weekly, The Guardian is part of the Guardian Media Group, owned by the S

• United Kingdom - Country in Europe

  The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom or Britain, is a sovereign country located off the north­western coast of the European mainland.

• University of Cambridge - Collegiate university in Cambridge, England

  The University of Cambridge is a collegiate research university in Cambridge, United Kingdom. Founded in 1209 and granted a royal charter by King Henry III in 1231, Cambridge is the second-oldest university in the English-speaking world and the world's fo