Breastfeeding has major benefits on infant health outcomes and their physical and mental development, but the effect on allergic disease risk remains controversial (1-3). We used the large GINIplus cohort (4) to study short and long term effects of full breastfeeding during the first 4 months compared to formula or mixed feeding on the occurrence of eczema, allergic rhinitis and asthma from birth up to age of 15 years.