While effective HIV treatment greatly reduces the risk of onward transmission during breastfeeding, it does not appear that the risk is zero, a leading paediatrician told the British HIV Association (BHIVA) conference in London last week. Although formula feeding is the safest option in high-income countries, some women will choose to breastfeed and healthcare professionals should support them to do so as safely as possible. Dr Hermione Lyall of St Mary's Hospital, London said that she and