According to the latest estimates published in The Lancet journal, complications from premature births and pneumonia are now the leading causes of death in children under five years, together responsible for nearly 2 million deaths in 2013.
Researchers led by Professor Robert Black, of Johns Hopkins Bloomberg School of Public Health in US, examined what caused an estimated 6.3 million deaths of newborn babies (neonates) and children under five years in 2013.
They found that complications from preterm birth were the largest single cause, responsible for 9,65,000 deaths in under-fives, with pneumonia responsible for a further 9,35,000 deaths, 'Medicalxpress.Com' reported.
The analysis found that more than half (51.8 per cent) of children died from infectious causes, including pneumonia, diarrhoea, and malaria.
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The results are published as the 2015 deadline for the Millennium Development Goals (MDGs) approaches, with MDG4 (to reduce by two thirds, between 1990 and 2015, the under-five mortality rate) unlikely to be achieved by more than a handful of countries, researchers said.
"Despite remarkable progress at the level of global averages, at national level, MDG 4 will not be achieved in most countries in 2015," they said.