02/05/2026
So turns out “Mom Brain” is a real thing
Many neurological changes take place during pregnancy and postpartum, these are just a few!
Many studies (from the UK, Spain, US and more) have confirmed that there is grey matter reduction during pregnancy, a 4-5% volume decrease. Following birth it begins to reorganize and grow, but studies have confirmed that full return does not happen until approximately 6 years postpartum (meaning multiple pregnancies over the years can lead to grey matter reduction for a good portion of a woman’s early adulthood!) This reduction is due to increased efficiency (for bonding, empathy, attunement, caregiving , identity - it’s a process of pruning to become more adept, similar to what takes places during adolescence - so the research suggests) but it creates symptoms for women such as memory loss, brain fog, difficulty focusing/concentrating, increased emotional sensitivity, word finding struggles/word confusion. Research has confirmed this reduction is the result of estrogen changes (and studies query if this process repeats itself during perimenopause!?!) Grey matter reduction also increases pain tolerance, so is believed to be a natural instinct for preparing for labor.
While grey matter reduces, the Hippocampus increases, believed to be an integral process in bonding, social connection and attunement, as well as helping with emotional processing. Interesting note, some studies have shown that women who have traumatic births and extremely difficult postpartum mental health experiences have larger hippocampus’s and amygdala’s (the body’s stress alert system!)
For adolescents, the fact that many of these changes are happening already is why many researchers believe they are more at risk for postpartum complications. They already have intense hormonal changes and reactive emotional centres of their brain, and the impact of pregnancy further changes and impacts these areas.
So recap
Memory loss, brain fog, speech alterations can happen during pregnancy
The deep emotions, social connection, higher emotional sensitivities are parts of the ways your brain helps you manage motherhood even though at times it can feel like too much!