To date, HIV vaccine development in infants has had minimal research funding. This lack of prioritization may be attributed to safety concerns, such as increased risk of HIV acquisition from an experimental HIV vaccine, as well as to perceived theoretical causes of impaired immunogenicity due to the neonates' immature immune system, blunting of the immune response in the infant because of placental and breast milk transfer of maternal antibodies, and concern for priming an ineffective immune response, thus creating an inability for the infant to develop a potentially effective immune response from a subsequent vaccine regimen (so-called original antigenic sin) [8].