What is screen time doing to children?

Two months ago Daisy Greenwell and Clare Fernyhough set up a WhatsApp group to discuss how to stave off their young children’s demands for smartphones. After they posted about their plans on Instagram, other parents wanted in. Now their group, Smartphone-Free Childhood, has more than 60,000 followers debating how to keep their children away from the demon devices—a debate they are naturally conducting on smartphones of their own.

This group, based in Britain, is not the only one worried about children’s screen time. Last month the state of Florida passed a law banning social media for under-14s. Britain’s government is reportedly considering a ban on mobile-phone sales to under-16s. The concerns are summed up by a recent book by Jonathan Haidt, “The Anxious Generation”, which argues that smartphones, and especially the social networks accessed through them, are causing a malign “rewiring of childhood”.