How Men's Bodies Change When They Become Fathers

New moms go through a ton of physical changes during pregnancy and after childbirth, but that doesn’t mean that new dads sail through those 9 months unaffected. There are many ways men’s bodies change as they transition to fatherhood, too.

Lower Testosterone

Testosterone—the manly hormone—is responsible for male sex drive, aggression and baldness. Studies show that women find men with higher testosterone levels more attractive. While testosterone evolved to help motivate men to find partners with whom to procreate, having bubbling hormones may not be useful to new dads who should be focusing on Mom and baby—not roaming the savannah looking for hook-ups. 

A 2011 study found that testosterone levels in new dads drop below the average levels of non-dads. Other studies have replicated these results and found even more interesting tidbits. For example, the more a new dad’s testosterone drops, the greater his involvement is in household chores and baby-related duties. 

Higher Oxytocin

Oxytocin—the love hormone—increases during pregnancy, labor and breastfeeding, enhancing a new mom’s deep bond with her baby. 

We used to think that only new moms had high oxytocin, giving them a flush of “feel-good” boosters to help them bond with their babies. However, it’s now clear that new dads get a boost of oxytocin, too! Studies show that new dads have higher levels of oxytocin than men without kids.

Interestingly, oxytocin in moms was most triggered by comforting their kids while oxytocin in dads was most triggered by playing with their children.

Brain Changes

Beside hormonal shifts—and adding an extra 10 pounds of “sympathy weight”—a new dad’s brain also undergoes changes. A 2014 study found that their brains mirrored the changes that new moms experience: By 12 weeks postpartum, the parts linked to empathy, nurturing, and attachment thicken up.

The Take-Away

Of course, the stretching, morphing and incredible changes new dads experience are tiny compared to new moms. But, now we know that women aren’t the only ones who physically change as a result of parenthood!

Avertissement : Les informations présentes sur notre site ne constituent PAS des conseils médicaux pour une personne ou une condition spécifique. Elles sont uniquement destinées à titre d'information générale. Si vous avez des questions médicales et des préoccupations concernant votre enfant ou vous-même, veuillez contacter votre fournisseur de soins de santé. Le lait maternel est la meilleure source de nutrition pour les bébés. Il est important que, en préparation et pendant l'allaitement, les mères adoptent une alimentation saine et équilibrée. La combinaison de l'allaitement au sein et au biberon dans les premières semaines de vie peut réduire la production de lait maternel de la mère et il est difficile de revenir sur la décision de ne pas allaiter. Si vous décidez d'utiliser une préparation pour nourrissons, vous devez suivre les instructions avec soin.