More than 600 sixth formers celebrated reaching their fifth birthday on Tuesday to highlight the plight of children in the developing world who do not have the same chance.

The sixth formers, from over 50 schools and colleges, were in London for the annual Global Student Forum which this year was centred on the theme of child mortality.

The GSF is an initiative of Christian charity Damaris Trust to enable school students of all faiths and none to think carefully about the spiritual, moral, social and cultural issues underlying global citizenship, and to help others to do the same.

"9.2 million children in the developing world die before their fifth birthday mostly from preventable illnesses like malaria and stomach bugs," said Laura Seaton of Alleynes High School in Stone, Staffs.

"Not only is it a tragedy but a violation of child rights. We were lucky enough to enjoy a fifth birthday among friends and family but for millions of children their fifth birthday will be another day of food insecurity, poor sanitation and worsening conditions."

All students at GSF will be trained and equipped to become peer educators through leading assemblies and lessons on their return to school.

"Since beginning GSF in 2005 we have seen enthusiastic young people return to their schools and communities and encourage thousands of their peers to get involved in positive action for global change," said GSF founder and head of the Damaris Trust, Nick Pollard. "Young people listen to - and are motivated by - young people. It's a simple fact."

This year's annual London forum was themed "If I grow up I want to be alive". It was joined by International Development Minister Mike Foster and The Speaker contestant 17-year-old Irene Carter.