AAP recommends against breastfeeding infants of HIV-infected mothers:

http://pediatrics.aappublications.org/content/early/2013/01/23/peds.2012-3543.abstract?papetoc

“It is critical that physicians are aware of the HIV transmission risk from human milk and the current recommendations for feeding HIV-exposed infants in the United States. Because the only intervention to completely prevent HIV transmission via human milk is not to breastfeed, in the United States, where clean water and affordable replacement feeding are available, the American Academy of Pediatrics recommends that HIV-infected mothers not breastfeed their infants, regardless of maternal viral load and antiretroviral therapy.”

Thanks to Mike Hart for sharing this link.