How Motherhood Changes Your Brain
Did you ever hear that joke about āmummy brainā? If I could remember it, then I would tell you. The phenomenon of āmum brainā has been endlessly used as a punchline. The gist of the joke is usually that mums become forgetful or moody.Ā And, itĀ turns out that the mental changes you feel during pregnancy and motherhood arenāt all in your head. Researchers have found that a motherās brain undergoes significant changes as a woman becomes a mum. But contrary to all of the wisecracks, mum brain is notĀ a bad thing! All of those neural developments actually serve some pretty amazing purposes.
Mum brains get smallerā¦and bigger.
The brains of pregnant women undergo a radicalĀ transformation thanks to hormone surges. In fact, mumsā brainsĀ change moreĀ during pregnancy and postpartum than they do at any other point in lifeāincluding puberty! Part of the reason for this is a process of synaptic pruning where the brain essentially cuts off function to areas that it no longer needs in order to build up the areas that are now crucial. For mothers, it appears that the outer layers of gray matter that help control muscle movement, memories, emotions, and decision making are reduced. Some researchers think this is why mums become moody and forgetful. In one study, researchers were able to clearly see that the brains of mothers were actively pruning gray matter to make way for newer synaptic connections that would help her protect and take care of her baby.Ā
Mum brains become more protective.
You know how mums joke about their 'inner mama bear'? That ferocious, mind-dwelling creature that gnashes its teeth when our kids are threatened actually serves a purpose! During pregnancy, a motherās brain partially rewires itself to better detect danger with a particular sensitivity toward angry or fearful facial expressions. Researchers have found this to occur in stages that appear to correspond with pregnancy trimesters. The strongest vigilance toward threats seems to happen during the second and third trimesters, and some researchers believe this is because mum brains are building up new synapses to help her adapt to motherhood. In other words, Mama Bear is wired to be fiercely protective of her cubs!Ā
Mum brains are built for empathy.
Mum brains are incredibly loving by design. Studies have found that all that synaptic pruning and neural building that fundamentally alters the physical structure of a motherās brain serves another critical purpose: empathy building. Researchers have unearthed strong evidence that mums respond to infant cues like crying, snuggling, sleeping, etc., with an increase in brain activity that governs empathy, self-monitoring, and reflection. In other words, when a mother bonds with her baby by tending to their needs, the part of her brain that manages empathy actually grows. Awww!
Mum brain doesnāt go away.
It turns out that mum brainĀ does not vanish once your little one is no longer a babyābut that is actually not a bad thing. In some studies, like this one, researchers found that even after two years postpartum, mums did not gain back the gray matter they lost during pregnancy. And while that might seem a bit alarming, rest assured that Mother Nature has another trick up her sleeve. It is believed that one reason mum brain sticks around is because it helps mothers turn into amazing grandmas later in life. The same protective, empathetic, hyper-focused attention around tending to children seen in brain scans of new mothers appears to help grandmothers lend a hand in raising the next generation.
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