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Résumé La collaboration entre pédiatres et pédopsychiatre est nécessaire dans la prise en charge des troubles alimentaires chez le nourrisson pour comprendre – une fois l’étiologie organique explorée – ce qui a pu engendrer ou aggraver ces troubles. Plusieurs exemples viennent illustrer ce propos où l’observation attentive et croisée de la relation mère-enfant et du contexte familial et socio économique permet de comprendre certaines anorexies ou hypotrophies sans cause organique.

When taking care of infant’s feeding disorders, collaboration between paediatricians and paedopsyachiatrists is necessary - once the organic aetiology has been analysed - to understand what may have caused or increased these dysfunctions. Many examples can illustrate this assessment demonstrating that an accurate observation of the mother- infant relationships and of the social as well as of the economic context may lead to the ability for understanding some anorexia or hypertrophies deprived of any organic root.