Navyaan Siddiqui and Dr. Kelsey Perrykkad wanted to settle something that new parents have complained about for generations—the fuzzy thinking, the forgotten words, the sense that becoming a mum or dad somehow scrambles your brain. What they found at Monash University's Cognitive Neuroimaging Lab surprised even them: there is no such thing as "baby brain."
The research matters because "baby brain" is so deeply embedded in how we talk about new parenthood that most people assume it must be real. Millions of new mothers—and increasingly, fathers—report feeling scattered, forgetful, and cognitively foggy after their babies arrive. But despite these widespread complaints, scientists have struggled to find objective evidence that parenthood actually damages memory or cognition. The Monash study, published in the journal Cortex, is the largest and most comprehensive investigation yet, and it offers parents genuine reassurance backed by rigorous science.
The team examined 150 birth-giving mothers and 150 non-birth-giving fathers up to two years after their babies were born, comparing their cognitive performance against 300 non-parent controls (both male and female). Using a comprehensive battery of cognitive assessments, they tested memory, attention, executive function, and other mental abilities. The results were striking: both mothers and fathers performed essentially identically to the non-parent controls across every cognitive measure. Performance remained stable regardless of how old the baby was, even during the early months when sleep deprivation is typically at its worst. If "baby brain" were real, these parents should have shown measurable decline. They didn't.
The puzzle deepened when the researchers looked at subjective reports. When asked to rate their own memory and cognition, something unexpected emerged: non-father men reported better memory than all other groups. But this self-promotion bias vanished in the fathers—Siddiqui suspects driven by the accumulated exhaustion of nighttime parenting. In other words, new fathers weren't objectively worse at thinking; they just felt worse, and that feeling apparently crushed their confidence.
Dr. Perrykkad put it plainly: "When we do find evidence for baby brain, it is more related to sleep and well-being than a true objective decline in cognition." The research suggests that what new parents experience as "baby brain" is real as an experience—the fatigue, the stress, the overwhelming cognitive load of caring for a helpless human—but it is not evidence of actual cognitive impairment. The gap between feeling scattered and actually being scattered turns out to be significant.
This finding doesn't minimize what new parents endure. The study confirms that sleep deprivation and the emotional weight of early parenthood genuinely affect how parents feel about their own mental sharpness. But it reframes the conversation: the problem is not that parenthood damages your brain. The problem is that parenthood can be profoundly exhausting, and exhaustion makes everything feel harder, including thinking.
For new parents reading this—especially new mothers, who shoulder disproportionate cultural expectations about "baby brain"—the takeaway is liberating. Your memory isn't broken. Your cognition hasn't declined. What you need is sleep, support, and permission to be gentle with yourself while you adjust to one of life's most demanding transitions. The brain you bring to parenthood is the same brain you'll have when your child turns two.