In its annual health report for 2010, the World Health Organisation says that though some countries have made significant headways, others may struggle to meet some of the 2015 targets of Millennium Development Goal.
"With five years remaining to the MDG deadline in 2015, there are some striking improvements," said the report, which is based on data collected from WHO's 193 member states.
According to the report, Mozambique, Sierra Leone, Liberia and Rwanda have shown progress on child mortality.
However the group said global results mask inequalities between countries, and some nations' progress had been slowed by conflict, poor governance or humanitarian and economic crises.
The Millennium Development Goals were set in 2000 by 189 heads of state seeking to drive global policy to tackle poverty, hunger, ill-health and lack of access to clean water, among other things.