An estimated 3.2 million children were living with HIV at the end of 2013, mostly in sub-Saharan Africa. Majority of them acquire HIV from their HIV-infected mothers during pregnancy, birth or breastfeeding. With efficacious interventions the risk of mother-to-child HIV transmission can be reduced to 2%. However, such interventions are still not widely accessible or available in most resource-limited countries where the burden of HIV is highest. And these children who are already infected with HIV need to be enrolled in effective treatment to stay healthy.