The Scientist Who Scans Fathers' Brains: The Parenting Checklist You NEED Before You Have Babies!
What actually happens to a man's brain, hormones, and body when he becomes a father. The biology is more specific than anyone tells you, and it changes what good preparation looks like.
"Great fathers are made not born. There's a lot you can do." — Dr. Darby Saxby
Dr. Darby Saxby, on the episode
Dr. Darby Saxby is a neuroscientist and researcher who has spent her career scanning the brains of new parents, sampling their blood and cortisol, and watching them fight on camera, all to understand what the transition to parenthood actually does to the human body and the couple relationship. The pop version of fatherhood biology is that men are basically bystanders to a process that happens in women. The actual finding from her lab is that fathers undergo measurable, adaptive changes to brain structure, testosterone, oxytocin, and body composition that are calibrated specifically to how involved they choose to be. This protocol pulls the most actionable findings from her research: what the biology means for new dads, what pre-birth preparation actually moves the needle, and where most couples predictably go wrong before they realize it.
Tactic 01
Dr. Darby Saxby, The Diary of a CEO
The Mid-Range Testosterone Window
The play
Stay hands on with your baby while protecting your sleep, exercise, and joyful activities.
Dr. Darby Saxby says
Men typically show a drop in testosterone when they become hands on fathers. When men spent more time changing babies, doing hands-on care, and sharing a sleeping surface with babies, they had more of a testosterone drop and more profound brain shrinkage, which looks adaptive. I don't want to discourage dads from being hands-on with their kids because they're worried they're going to pay some kind of physiological tax. Make sure you're protecting your sleep, getting time to exercise and socialize, and participating in activities that bring you joy. It's hard to optimize your way out of these natural changes.
Try this
Stay hands on with baby care while protecting your sleep, exercise, and time for joyful activities, rather than trying to prevent a natural testosterone drop.
