'Now is the time to stop talking and take action,' says Labour MP David Lammy.
Three experts tackle the problem raised by the PM on the steps of No.10.
What parents can do to boost children's mental health.
Facebook and ASKfm were rated the 'riskiest' sites.
'I never imagined I would be holding my baby at graduation.'
They are calling for compulsory sex and relationships education for teens.
'MPs have a once-in-a-generation chance to make the change.'
'Thank you for teaching me that drugs ruin lives and break families apart.'
Some kids are providing 50 hours of care on top of school every week.