A pioneering exploration of how fatherhood transforms the brains, bodies, health, skills, and relationships of men. In recent years, men's attitudes toward fatherhood have changed dramatically. But only now do we learn how deeply fatherhood changes men's brains and biology – and the effects of these changes on their health, skills, relationships, and sense of purpose.

In Dad Brain, one of the leading researchers in fatherhood, Darby Saxbe, provides a captivating description of this new science, full of insights into how different approaches to fatherhood affect not only men but the entire family. Among many revelations are: • Fathers' brains shrink and their testosterone levels decrease • Fathers undergo a series of hormonal changes previously thought to affect only women • Fathers can suffer from postpartum depression but enjoy better long-term health • Fathers are better managers and their playfulness makes their children more resilient • In the West, fathers usually sleep less than mothers, but mothers sleep worse than fathers • Dads who do more chores around the house are generally happier • The majority of women prefer ‘dad bods’.

Above all, Dad Brain shows that men are wired to participate in caregiving just like women, but many of these adjustments are activated only when fathers invest time and practice in fatherhood. The more they engage, the more their brains and bodies change, and the better they become at it. Ultimately, it demonstrates that a good father is not something you are, but something you become.

'Fun and exciting... essential reading' Eve Rodsky 'A wonderful book... by a successful scientist' Antonio Damasio 'Masterful, science-filled, offering unique and practical insights' Daniel J. Siegel