A baby being given medicine by his mother
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Helping stop mothers giving their babies HIV

14 October 2013 Last updated at 06:32 BST

Africa carries the biggest burden of HIV in the world, but the picture is improving through a concerted effort to prevent mother to infant infections.

A combination of drugs and education programmes means that only half as many HIV-positive mothers in Africa are now passing on the virus to their babies, compared to a decade ago.

The BBC's Anne Soy visited one such baby and his mother in Nairobi.