If we’re serious about tackling ‘lost boys’, toxic influencers and men’s mental health, the answer may not be found in therapy or classrooms, says Dr Katie Splevins – but in the nursery P icture a father at 3am, pacing the floor with a baby pressed against his chest. He’s exhausted, bleary-eyed – but something extraordinary may be happening. fMRI studies show that when men – heterosexual or gay – care for their infants , their brains adapt. Activity increases in circuits that heighten alertness