A series of reviews into the deaths of 12 children known to state services has found that a lack of access to mental health services was a "strong theme" in many of the cases.
The independent National Review panel said that three out of four young women who died by suicide since 2010 had been on long waiting lists for mental health services - with one unable to access help in the days before her death.
The independent review group said that a multi-agency mental health service is needed if children are to get the care they need.
Helen Buckley of the National Review Panel said vulnerable children are often left waiting up to two years for psychology services, with crisis treatment often unavailable at short notice.
"This is an example of how messy, inaccessible, and bureaucratic mental health services are," she said.
"When you hear things on the media saying: 'if you're feeling low, talk to somebody' – that's very disingenuous if the services - the correct and appropriate services - aren't there."