Pré-publication, Document de travail: This paper analyzes the respective impact of aid, remittances and medical brain drain on child mortality using panel and cross-country quintile-level data on respectively 84 and 46 developing countries. Our results show that remittances reduce child mortality and that the impact of health aid is non-linear, suggesting that health aid is more effective in the poorest countries. By contrast, medical brain drain is found to have a harmful impact on child mortality. Last, remittances seem to be more effective in reducing mortality for children belonging to the richest households, whereas neither pro-poor nor anti-poor effect is found for health aid.