This Technical Report presents the results of a European Study on “Children's mouthing behaviour in contact with toys”. It provides statistical data on the duration and frequency that children under 36 months introduce toys into their mouths and estimated data on the time children under 36 months spend mouthing toys each day. Furthermore, it provides information on: — the literature focused on children's mouthing behaviour, including commonly used methodologies and significant results; — the design and methodology of the study; — the data on the children and toy sample; — the forms used in data collection.