The UN's latest assessment of global cases of HIV/Aids shows there has been a further drop in new infections among children.
There were 330,000 new infections in children last year - the figure is 24% lower than in 2009.
But the report by UNAids also warns "significant additional effort is required" if broader targets to tackle HIV/Aids are to be achieved by 2015.
The agency's director said the pace of progress was speeding up.
Overall, 34 million people around the world are now thought to have the virus that causes Aids.
The number of new infections in adults has stayed broadly stable for the past four years - at about 2.5 million new cases a year.
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