Media type: E-Article Title: The Role of Ecological Factors in Emotional Development in Infancy Contributor: Spitz, Rene A. Published: JSTOR, 1949 Published in: Child Development, 20 (1949) 3, Seite 145 Language: Not determined DOI: 10.2307/1125870 ISSN: 0009-3920 Keywords: Developmental and Educational Psychology ; Education ; Pediatrics, Perinatology and Child Health Origination: Footnote: Access State: Open Access