During pregnancy and then in childbirth, new mums experience some dramatic hormonal changes. But while these changes in women are relatively well studied … there’s a growing body of evidence finding that biological changes - shifts in hormones and brain activity - happen in men, too. And these shifts are just one part of the picture. Men can also experience mental health issues when they become a new dad, like postnatal depression. On All in the Mind this week, the psychological and biological changes that happen during the transition to fatherhood.