Breast-feeding,which helps build a baby's immune system, may be the best option for HIV-infected mothers in developing countries, despite the risk of transmitting the virus that causes AIDS to their babies, accroding to new studies presented some days ago.HIV-positive mothers generally are counselled to feed their babies formula to limit the risk of transmission of the human immuodeficiency virus, but that has caused problems in nations where clean water and other needs may not be met.Hoosen Coovadia a pediatrician at South Africa's University of KwaZulu-Natal said that instructing HIV-infected mothers in developing nations to breast feed would result in about 300,000 children becoming infected with HIV, but would save 1.5 million from dying of other diseases.