Dad Brain: What New Fathers Need Us to Understand

For years, the story of the "fourth trimester" has centered on mothers, and for good reason. But new research is making it clear that fathers are going through a transformation of their own, one that is biological, emotional, and deeply worth naming in the therapy room.

Our clinical team recently spent time with Dad Brain: The New Science of Fatherhood and How It Shapes Men's Lives by psychologist Darby Saxbe, PhD, whose USC lab has run one of the only longitudinal studies of men's brains as they become fathers. The book has drawn praise from Daniel Siegel and from Aliza Pressman, author of The Five Principles of Parenting, and it gave our clinicians a lot to talk about.

Fathers' Brains Change Too

Saxbe's research shows that new fathers experience real neurological and hormonal shifts. Testosterone drops. Oxytocin and prolactin rise. These changes are not incidental. They support bonding and emotional attunement, and they work against paternal detachment. In other words, biology is nudging dads toward connection, even when the culture around them has not always given them permission to lean into it.

That drop in testosterone paired with a rise in bonding hormones can also produce something very real: brain fog, confusion, and heightened emotional sensitivity. Sound familiar? These are symptoms often associated with the postpartum period for birthing parents. Naming them for fathers, too, normalizes an experience many men have quietly assumed was theirs alone to manage.

Why So Many Dads Don't Ask for Help

Despite the research, most men still don't seek support. The reasons are familiar: societal pressure to appear strong, a shortage of resources built specifically for men, and a habit of putting a partner's recovery ahead of their own. Part of our job as clinicians is helping fathers see that tending to their own mental health is not a departure from being a good partner. It is a requirement of it.

We also talked as a team about how to hold this conversation without minimizing the mother's experience. The goal was never to shift focus away from mothers, it is to widen the circle of support so that both partners are resourced, which tends to lower conflict and strengthen the whole family system.

What This Looks Like in Session

A few strategies our clinicians are bringing into work with fathers and couples:

• Somatic tools. Offering a menu of grounding activities gives men a low-pressure way into emotional awareness, especially when talking about feelings does not come naturally yet.
• A "job description" exercise. For fathers without strong role models, defining on paper the kind of parent they want to be can turn an abstract goal into something concrete and achievable.
• Neuroplasticity education. Understanding that the brain is still adapting can be genuinely empowering. It reframes the disorientation of new fatherhood as temporary and purposeful rather than a personal failing.
• Skin to skin and bonding routines. Simple, repeatable physical contact builds the same attachment pathways researchers are seeing in the brain scans.
• Reframing "Dad Brain" as specific, not universal. In couples work, this language helps a father describe his experience honestly without it landing as a competition with his partner's.
• One-on-one time with baby for each parent. Protecting individual bonding time, not just shared caregiving time, helps both partners build confidence in the role.

We also recognize that the research base has gaps. The book focuses mainly on first-time fathers and does not address men navigating a second or third child, or fathers coping with infertility and pregnancy loss. Those are real clinical needs, and they call for resources built specifically to meet them.

Resources Worth Sharing With the Dads in Your Life

If you are a father, or you love one, these are places built specifically with dads in mind:

• PSI Help for Dads — Postpartum Support International's dedicated page for fathers, with a weekly call-in support line, a peer support directory, a closed Facebook group, and a free "Connect by PSI" app.
• PSI Dad Support Group — A free, peer-facilitated online group for dads from pregnancy through the toddler years.
• Postpartum Men — A site built specifically for men navigating depression or anxiety after a baby arrives, with a self-assessment and an online forum.
• Mental Health America: Men and Mental Health — Straightforward information on symptoms, stigma, and how to get support.
• International Father's Mental Health Day — PSI's father-focused awareness campaign, founded by paternal postpartum depression survivor Mark Williams, with resources for dads and the people who support them.

If you're a Thrive client and would like support navigating this transition, whether you're the new father, the partner, or both, we're here.