The happiness of young people has taken a big hit since the advent of the smartphone - and social psychologist Jonathan Haidt argues that there is a direct link. He warns that allowing children easy access to the internet and social media adversely impacts their sleep, their self-esteem and even how their brains develop.

Jonathan explains the dangers he sees in letting kids use smartphones, while Jill Murphy of Common Sense Media suggests ways parents can navigate introducing tech into children's lives.

This series on parenting coincides with Dr Laurie's new free online class, The Science of Wellbeing for Parents which is available now at Coursera.org. You can sign up at drlauriesantos.com/parents.

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