New study debunks 'baby brain' myth—sleep, not parenthood, affects memory

A new study has cast doubt on the idea of 'baby brain'—the belief that parents experience memory loss after having a child. Published in the journal Cortex, the research tracked 400 people and found no measurable cognitive decline in mothers or fathers compared to non-parents. Instead, sleep quality emerged as a key factor in perceived forgetfulness. The study followed participants for up to two years after childbirth. Researchers conducted tests in people’s homes to mirror real-life conditions. Despite common reports of memory lapses—with around 80% of mothers describing cognitive fog—the data showed no difference in performance between parents and non-parents at any stage.

Both mothers and fathers reported feeling forgetful, challenging the assumption that 'baby brain' affects women alone. Interestingly, male non-parents rated their own memory more highly than any other group, including fathers. The team also noted that expectations about 'baby brain' might shape how parents interpret normal lapses in memory. Sleep disruption, rather than parenthood itself, appeared to drive much of the perceived decline. This finding suggests that fatigue, not biological changes from having a child, plays a bigger role in memory complaints.

The results question long-held stereotypes about parental forgetfulness and their impact, particularly on women. With no evidence of cognitive decline linked to parenthood, the study points to sleep and psychological expectations as more likely explanations. This could shift how society views—and supports—new parents in work and daily life.