Ergonomic criteria for the design of pacifiers. Pacifiers are everyday companions for babies and toddlers. The general safety requirements to reduce the risk of accidents with pacifiers are described in EN 1400-1:2002-12. This paper describes an analysis of the anatomical, physiological or psychological needs of the users based on literature search, screening of design solutions and interviews with parents and specialists in pediatric dental surgery, pediatric dentistry, speech therapy, postpartum care and breastfeeding counseling. As a result, essential ergonomic design criteria for pacifiers are described which complement existing safety requirements and are meant to increase the usability of pacifiers.