The largest and most comprehensive study of memory and cognition in new parents has found no evidence for "baby brain" in mums and dads. New mums often complain about having "baby brain," where memory and cognition become vague and unreliable. Now a Monash University study—the largest ever done comparing cognitive ability in new mums and dads—has unequivocally found no evidence that "baby brain" reflects underlying problems with cognition that result from becoming a parent.