Global inequalities in wealth are at their highest level for 20 years and are "harming children's life chances", according to a new report by Save The Children.
While the charity's report, Born Equal, acknowledges progress has been made in goals such as reducing child mortality it suggests this has been uneven across income groups.
"In recent decades the world has made dramatic progress in cutting child deaths and improving opportunities for children; we are now reaching a tipping point where preventable child deaths could be eradicated in our lifetime," said StC chief executive Justin Forsyth.
"Unless inequality is addressed... any future development framework will simply not succeed in maintaining or accelerating progress. What's more, it will hold individual countries - and the world - back from experiencing real growth and prosperity."
The report was released ahead of today's [1 Nov] meeting of a high-level UN panel on poverty.
Save The Children's researchers found that in most of the 32 developing countries they looked at, the rich had increased their share of national income since the 1990s.
In a fifth of the countries, the incomes of the poorest had fallen over the same period with the gap particularly pronounced among children, affecting both their well-being as well as causing disparities in several key indicators.
For example, it notes that in Tanzania, child mortality in the richest fifth of the population fell from 135 to 90 per 1,000 births over the research period, while the poorest fifth saw hardly any progress with a modest fall of 140 to 137 per 1,000 births.
Read the full report at www.savethechildren.org.uk/sites/default/files/images/Born_Equal.pdf