baby brain

informal A name for the cognitive issues, such as confusion and forgetfulness, commonly experienced by pregnant women. I just had my keys—now where are they? Ugh, this baby brain is getting old! I'm surprised Colleen remembered we were meeting today—she's had baby brain pretty bad with this pregnancy. A: "Hey, why didn't you call me back last night?" B: "Baby brain. I totally forgot, I'm so sorry!"