The number of children around the world who die each year from causes that could be prevented, is equal to the number of people killed in the Holocaust in World War II.
A new study released this week by the United Nations has confirmed that around 6.3 million children under the age of 15 died from mostly preventable causes last year.
This means there is a child dying somewhere in the world every 5 seconds.
Newborn babies account for half of the deaths.
The new mortality estimates study, was released on Monday by the UN Children's Fund, together with UN Children's Fund UNICEF, the World Health Organization WHO, the UN Population Division and the World Bank.
According to Laurence Chandy, UNICEF Research Director, major progress in reducing child mortality has been made in the last quarter century, with the toll dropping by more than half since 1990, but "millions are still dying because of who they are, and where they are born."
Children from Sub-Saharan African are disproportionately affected, with half the deaths of children under 5, taking place in the region. One third are in Southern Asia.
He added that, without urgent action, 56 million children under-five will die between now and 2030, and half of them will be new-borns but that, "with simple solutions like medicines, clean water, electricity and vaccines, we can change that reality for every child."
Most deaths of children aged 5 and under are due to preventable or treatable causes such as pneumonia, malaria or complications during birth.
For older children, between the ages of 5 and 15, injuries become a more prominent cause of death, particularly road accidents and drownings.
Even within countries, wide disparities are found, with under-five mortality rates on average 50 per cent higher in rural areas than in urban areas. Education is also a factor, with those born to uneducated mothers more than twice as likely to die before turning five than those born to mothers with a secondary or higher education.
Reacting to the study, Tim Evans, Senior Director of Health Nutrition and Population at the World Bank, said . "Ending preventable deaths and investing in the health of young people is a basic foundation for building countries' human capital, which will drive their future growth and prosperity."