It is well-established that food proteins, such as egg, soya, cow's milk and wheat, are detectable in breastmilk for many hours or days after ingestion. Exposure to these proteins is important to the process of developing tolerance but can also sometimes elicit IgE-mediated and non-IgE-mediated allergic symptoms in breastfed infants. Non-IgEmediated allergy, outside of food protein-induced allergic proctocolitis and eosinophilic oesophagitis, is not well understood, leading to variations in the diagnosis and management thereof. A primary objective of the European Academy for Allergy and Clinical Immunology is to support breastfeeding in all infants, including those with food allergies. A Task Force was established, to explore the clinical spectrum of non-IgE-mediated allergies, and part of its objectives was to establish diagnosis and management of non-IgE-mediated allergies in breastfed infants. Eight questions were formulated using the Patient, Intervention, Comparison, Outcome (PICO) system and Scottish Intercollegiate | 15 MEYER Et al. Highlights MEYER Et al. consultancy in the past for AbbVie. CV gives academic lectures for Mead Johnson, Abbot, Danone/Nutricia and Nestle; and received research support from Thermo Fisher. AUTH O R CO NTR I B UTI O N S RM involved in the literature review, writing of sections in article, Delphi consensus, merging of article sections and final submission. ACL involved in the literature review, writing of sections in article, Delphi consensus and critical review of publication. CD, RK, ANW, GdT, DF, YV, MCV, OC, PU and NS involved in writing of sections in article, Delphi consensus and critical review of publication. CV involved in the literature review, writing of sections in article, Delphi consensus and critical review of publication.