A new study challenges the belief that women are biologically more responsive to a baby’s cries at night than men. The findings suggest that the gap in nighttime caregiving stems from social norms rather than biological differences.
Often referred to as an “acoustic umbilical cord,” a baby’s cry forms a strong connection with their caregiver, much like the physical umbilical cord did in the womb. In early infancy, crying serves as a key form of communication, meant to prompt a caregiver’s response.
Study Challenges the Notion That Women Are Biologically Wired for Nighttime Baby Care
It’s commonly believed that women are naturally “hardwired” to respond more strongly to a baby’s cries at night than men. However, a new study from Aarhus University in Denmark challenges this notion—though it doesn’t fully explain why mothers still take on most nighttime infant care.
“Contrary to what popular media often suggests, our male participants didn’t just sleep through a baby’s cries,” said Professor Christine Parsons, PhD, from the university’s Department of Clinical Medicine. “We saw a lot of variation in how people reacted to the sounds, with considerable overlap between men and women.”
The study set out to explore why mothers often take on more nighttime caregiving than fathers. Researchers focused on whether biological differences in how men and women react to a baby’s cries at night—prior to becoming parents—could help explain this disparity.
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The research was divided into three parts. In Study 1, 140 non-parents (76 women, 64 men) slept at home as a smartphone played baby cries and alarms at rising volumes. Researchers tracked when each participant woke up in response. The second study involved 117 Danish couples who had recently become parents. Each partner tracked how often they and their spouse got up at night over one week.
In Study 1, women were just 14% more likely than men to wake to low-volume sounds (33–44 dB). At louder volumes, there was no significant difference in how men and women responded to baby cries or alarm sounds. In short, women were a bit more sensitive to faint noises, but this advantage vanished as the volume increased.
Mothers Handle Majority of Nighttime Baby Care, Study Finds
In Study 2, the researchers observed that mothers were three times more likely than fathers to wake up and tend to the baby at night. Only around 1% of couples had fathers doing more nighttime caregiving than mothers, while roughly 23% split the duties evenly.
Study 3 used simulations to see if small waking differences from Study 1 could explain the caregiving gap in Study 2. If one parent woke up, they “responded”; if both did, one was randomly assigned. Simulations showed women doing 57% of nighttime care—well below the 76% seen in real life. In fact, none of the 500 simulations came close to replicating the actual gender disparity.
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“Mothers were three times more likely than fathers to handle nighttime care,” said lead author Arnault Quentin-Vermillet. “Our models show this gap isn’t explained by slight differences in sound sensitivity.”
Study Limitations Acknowledged, but Results Undermine Biological Basis for Caregiving Gap
Despite limitations like its focus on sound sensitivity and cultural context, the study questions the belief that women are naturally more responsive to a baby’s nighttime needs. Instead, the results suggest that social factors, rather than biology, may better explain the caregiving imbalance.
“We believe multiple, interconnected factors help explain our findings,” said Professor Christine Parsons. Mothers often start leave earlier than fathers, gaining more early experience soothing the baby. Also, if the mother is breastfeeding at night, it may be reasonable for the father to remain asleep.
The research adds to the ongoing dialogue around equal parenting and highlights the structural and societal shifts that may be necessary to move toward that goal.
The study was published in the journal Emotion.
Read the original article on:New Atlas