Dad Brain: The New Science of Fatherhood and How It Shapes Men's Lives

by Darby Saxbe

A groundbreaking exploration of the science and significance of fatherhood that shows great dads are made, not born

Over the last decade, we’ve learned more about the transformative power of parenthood—biologically, psychologically, and socially—than ever before. But while the experience of motherhood has attracted well-deserved attention, fatherhood has remained overlooked and, often, misunderstood.

Now, in Dad Brain, field-leading psychologist Darby Saxbe, PhD, explains how becoming a father changes men, from their bodies and brain architecture to their hormones and sense of purpose. Inspired by her relationship with her dad, Saxbe has studied fathers and families for over twenty years. In her first book, she takes readers behind the scenes of her new research and around the world, from hunter-gatherers in the Congo to contemporary suburban dads, and into her pioneering studies of how parenthood shapes men’s brains and lives.

Readers may be surprised to learn that, in addition to altering a dad’s hormones and health (yes, men experience postpartum depression, and “dad bod” is real), parenthood can also benefit men. Dads who spend time with their kids sharpen their paternal instincts and even show more youthful brains in later life. Dads’ unique approach to play makes kids more resilient, and fathers bring new insights to workplaces and build better societies. Ultimately, fatherhood can help men discover a richer, more connected, and more meaningful life.

For fans of science-based storytelling that is also irreverent, funny, and personal, Dad Brain offers an illuminating, empowering, and optimistic new understanding of fatherhood that will become a must-read for every parent.

Genres: Parenting, Nonfiction, Psychology, Science, Neuroscience, Health

304 pages, Hardcover

Expected publication June 9, 2026

Reviews

[Stetson · Rating 5 out of 5]

Dad Brain by Darby Saxbe argues that fathers are biologically equipped for nurturing children, albeit in some ways that are modestly different than mothers. She bases this claim on a broad reading of the evolutionary literature and then her own field's research, which uses brain imaging approaches on parents while tracking other behavioral outcomes. Based on this science, she thinks our parenting paradigm would benefit from getting more from fathers, which could be achieved if social attitudes concerning the status and value of care work changed. I think the biological and social capacity of men to be loving and competent parents is well argued, but it is not persuasively connected to professor Saxbe's normative vision, specifically the notion about the status of care work. What exactly will turning up male nurturing do for us? It isn't really specified other than to imply that material equality between the sexes is good, despite biology being an enormous hurdle. This portion of professor Saxbe's vision appears to do a hop-skip-and-a-jump over the whole reason why men and women are different and why it has been such a boon to divide labor roles in the first place. One of the reasons we live in such a prosperous and abundant time is that we've embraced specialization. Parenting our children is an eminently substitutable and not particularly high-skill activity that we embrace as an inefficient luxury because we love and cherish our children. This shows up in the data showing that marriage, having children, and heavily parenting them is increasingly practiced by the upper-middle class and wealthy. It is also hard to understand what exactly can be done to expand nurturing opportunities for men when men and women without college degrees seem unable to find consistent paths to marriage especially at a young enough age. It also seems to overlook how much our liberal society has already transformed to embrace non-traditional models of parenthood and male roles. All this change doesn't seem to have come at a benefit to marriage rates or boost the number of children being born. It seems the more parsimonious model may be that modern conditions are mismatched with evolved preferences concerning family formation and that these conditions are not related to the status of care work or the willingness of men to be involved parents.

Now, I don't want to sell the argument short. Dr. Saxbe does present some reasons to believe that social conditions, namely the technological basis of an economy, influences the division of labor between the sexes and that for most of recorded human history (and probably Mammalian history too) resulted in males protecting and provisioning of female partners focused on nurture offspring. Despite this general trend, there is still a facultative substrate for paternal care that can be elicit by prolonged proximity to women and children and that our modern economy and social environment afford this. The decline in the wage premium associated with physical strength and the liberalization of female economic and political rights. Subsequently, men can now reorient to domestic duties and nurturing children.

Unfortunately, I fear this narrative, while true in some ways, looks pasts some thorny biological and social realities. First, economic research studies have increasingly made clear that pregnancy and parenting reduce the economic output of women. The nail-in-the-coffin of the gender wage gap argument has been the finding that women who cannot get pregnant are not subject to a reduction in earnings. Second, the phenomenon of greater male variability means that there will be an elite segment of men committed to economic output in ways that simply won't be observed at a comparable rate among women. It makes sense for society to leverage this reality and optimize what these men can do for society at large. Further, the performance of these men will always set a standard for the rest of men, and thus, it should be expected that most men will derive their own sense of self worth from their ability to function similarly and, in no small way, women will judge the desirability of men on this or related dimension. There is simply no change in social attitudes that will utterly erase this social mechanism.

Given these combined biological and social constraints, it is still unclear what benefit would be reaped by men signaling and demonstrating their willingness and ability to care for and nurture children more than they are already. it is true that among a set of men of similar social status that their willingness and ability to nurture may make them a more desirable mate, but treating this reality as a generalized finding about what women want in a partner would be falling for a Berkson's paradox. especially if one believes that care work is culturally coded as low status. Further, I would have liked to see Professor Saxbe explore more directly that male social performance is in serious trouble among non-college educated men. What is to be done with the men that have no path to status? They largely cannot access HEAL profession without college degrees. There is no viable path toward boosting college enrollment, especially if the degree itself is just a proxy for another phenomenon, which it is.... There are a lot of oblique references to male social dysfunction, including name-checking Richard Reeves' initiatives, the Incel phenomenon, and Andrew Tate, but this is skimming the surface of a process that is many decades in the making and a political approach that's often been openly hostile to men of lower social status with impunity. Well, unless we count the elections of Donald Trump as acts of revenge, which some pundits have been inclined to do....

I (along with others like Lyman Stone) have had periodic online conversations/debates with Dr. Saxbe about some of these issues, raising these challenges. Nevertheless, Professor Saxbe holds to the idea that if men presented themselves as better caregivers and if care was celebrated by society (not sure what this looks like though), then women would flock to these men and have more kids. Dr. Saxbe is fond of citing South Korea as an example of a place where men send precisely the wrong signals about caregiving and this cashes out as low total fertility, but this example looks like cherry-picking. Total fertility in East Asia is just globally low. Other East Asian countries that have relatively more liberal gender attitudes like Taiwan and Singapore still have very lower total fertility, and the gender disparity in domestic work within East Asian doesn't predict fertility either. Arguably, there is an inverse correlation using TFR and OECD Time Use data, where N. Korea, Japan, and China have relatively higher fertility while women doing much much more domestic work than men than Singapore, Taiwan, and South Korea .

So why aren't women flocking to dad material men then? Why can college educated and affluent men access marriage and fatherhood consistently in a way apparently unrelated from their interest in care work? Why do conservatives and religious people tend to have more children than those with more liberal views of gender? These questions will remain for those who pick up this book, though it is perhaps not why one would pick up this book. Despite the omission, there is still useful lessons to pick up from those with feminist or leftist political commitments who are also committed to empiricism and are serious about maintaining a successful society and peaceful, prosperous world.

Professionr Saxbe's vision largely borrows the common line from those commenting on these issues from feminist perspective for awhile. It is understandable challenging for women to carry essentially two full time jobs, one in economy at-large and then one in the home, though this challenge is unique to the dual-income households or for single mothers which are a somewhat recent phenomenon and, in part, a goal of movement feminism. Dr. Saxbe, though, brings something more than just this familiar arguments as she feels the needs to respond to the clearly enumerated evolved biology of humans and its implication for relations between the sexes and having children, which have become increasingly salient in public discourse. To some extent, there is a stinging irony to the persistence of these concerns given that there have arguably been enormous feminist victories with respect to the issues of female social status and economic freedom and paternal contributions to childcare and domestic work. The typical level of involvement by fathers from the Millennial generation, primarily in wealthy, Western nations, has risen substantially compared to the recent past and possibly most of human history and pre-history. However, the rise of super-dads has corresponded with a decline in the marriage rate and total fertility, which Dr. Saxbe recognizes as not particularly salutary trends. This potential paradox doesn't demand much attention in Dr. Saxbe's book, but it is something her public commentary is attuned to. It isn't really a mystery if we look closely at what drives fewer marriages and children today. There are many causes of complex phenomena like this, but, to boil it down, we have an evolutionary mismatch that cultural evolution or political tinkering has not got around to solving: Liberated evolved female mate preferences paired with the decline in male social status relative to female social status along with contraceptive technology ubiquity and the decline in peer-to-peer social interaction due to changes in media technology and the economy have disrupt our marriage market and fertility outcomes,

I learned some things from this book, and Dr. Saxbe was careful about her claims. She was also willing to be serious about biology, which is sometimes as struggle for those on the political left, even scientists. Moreover, this is part of a growing, important, and urgent segment of public discourse. It's a book that is in conversation with a growing chorus from scientists, cultural critics, technocrats, and scientific communicators who hope science and culture can redress some challenges and complaints about modern parenting, fertility, and gender relations, including Emily Oster, Sarah Hrdy, Elena Bridgers, Alice Evans, Stephanie Murray, Lyman Stone, Richard Reeves, and many more. It is moving in the right direction, and I hope many take the time to read and engage!

*I plan to return to and expand on this review. I want to include more of the specific scientific studies that Saxbe presents in order to share more about how this work present how and why men can be competent and dedicated fathers.
**Disclaimer: I would like to thank Darby Saxbe for a galley copy of the work.

[Rebecca · Rating 4 out of 5]

3.5 stars, rounded up for the importance of the topic.

After reading Matrescence, which I highly recommend, I was intrigued to find out what research has been done on the minds and bodies of dads. Fortunately the writer of this book is one of the few researchers working on this topic.

The author uses studies from her lab and others to demonstrate a number of key points. For one, dads are biologically primed to be caretakers, regardless of many cultures’ insistence that care work is feminine and embarrassing for Important Men. Their brains react to their children in unique ways that are different from but analogous to the way moms’ brains react. Some of this reaction is innate and seems to be primed by being around a pregnant partner, but people (including gay dads, adoptive dads, etc.) can build these same neurological responses and capabilities by caring for a child. Dads being present and helpful can experience negative physical and mental health impacts because children are stressful, but the more involved a dad is, the better off he, his family, and his partner end up across a variety of domains.

There’s a tension here between focusing research and parenting resources on moms (who, generally being women, are already underserved by healthcare and society and just want this one win) and on dads (who are just forgotten about or dismissed altogether in this particular aspect of healthcare research). The author sensitively approaches this topic by arguing that a society that values fatherhood strengthens families and supports women too. There is a whole chapter devoted to paid parental leave and its positive impacts on families around the world.

The prose was serviceable, accessible to a non-academic audience but not particularly lyrical or emotional. (Seriously, go read Matrescence.) The author did a good job of explaining the replication crisis and the caveats with various studies, although that just means that the few studies we do have are piled with caveats and assumptions. That’s not really her fault, though; at least she’s doing the work, and her frequent exhortations for more research on and support of fatherhood are well taken.

Hopefully some important minds will be changed by this book and the next edition will have more research findings to pad it out. Recommended for psych nerds, parents, and people who are planning to be parents.

Thank you to Netgalley and Flatiron for giving me a copy of this ebook in exchange for an honest review.

[Francis Tapon · Rating 5 out of 5]

"Dad Brain" has two parts:
1) Science of Fatherhood
2) Practice of Fatherhood

The book is packed with fascinating info.
I'll cite two examples:

1) Dads usually turn babies outward when they're carrying them, whereas women/moms turn the baby inward (looking at each other's faces). Neither is better. Just different, important experiences.

2) Moms may be most important when kids are very young, whereas dads may become more important when kids are teenagers.

The author is sensitive when he makes such generalizations, tiptoeing around overly sensitive, reactionary people who get offended by the idea that men and women may be somewhat different. I'm a bit more blunt.

And I assume you can handle this fact since a book called "Dad Brain" implies that dad brains are different than mom brains.

For those who want to learn about such important differences, told more sensitively than I write, then this is a worthy book.

[Rae Bradshaw · Rating 5 out of 5]

Brain is an illuminating and surprisingly tender exploration of how fatherhood reshapes men from the inside out, blending neuroscience, psychology, and lived experience into a narrative that feels both authoritative and deeply human. Saxbe dismantles the myth of paternal emotional distance, showing instead how caregiving rewires attention, stress responses, and identity itself. The book’s strength lies in its balance: it’s scientifically grounded without being clinical, empathetic without drifting into sentimentality, and honest about the pressures modern fathers face. The result is a refreshing, research‑driven portrait of fatherhood as a transformative, biologically meaningful chapter in a man’s life.
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[Stephanie Peterman · Rating 4 out of 5]

while i appreciated and understood the insightful look inside the minds of dads from a physical and chemical standpoint, i think i more enjoyed the author’s dissection of the cultural shifts that have influenced the way we view the american dad and how much this has contributed to dictated societal norms. i love her ideas about rebranding caregiving jobs to boost male interest in female dominated careers to ultimately balance the pay gap. i could read a whole book just on this subject alone!

thank you to netgalley and the publisher for the ALC!

[Jade Augustine · Rating 4 out of 5]

I really appreciated this book as a mother-to-be. Reading this book has been incredibly insightful and eye-opening and helped me to understand my husband's perspective on impending parenthood more.

This is a little nitpicky and just be a thing in the ARC version, but the one thing that bothered me a little bit was that the subheadings were not capitalized properly.

I received a copy from Netgalley, but this review was freely given!

[Brian · Rating 5 out of 5]

A readable popular science book on the physiological, biological, psychological, and cultural effects of fatherhood. The book includes testimonials from both fathers and scientists, providing evidence that could be used for greater advocacy for fathers and families.

[M. · Rating 5 out of 5]

It was a good read.