A child who narrates their every move is not a budding narcissist but someone whose perspective-taking is still coming online, and even in adults we spend about a third of our talk on ourselves: what constantly talking about yourself usually means

Anyone who spends time around a four-year-old knows the running commentary. Look what I made, watch me, I did this, I have a red one, at my house we, and on it goes, a near-constant broadcast from the center of their own world. It can prompt a small worry in …