1 CHILD An important aspect of children's interstitial lung disease (chILD) is clear and concise classification of the diseases that enhance provider education and diagnostic abilities. Nathan et al.1 describe the European approach to diagnosing chILD, including descriptions of the most likely disease based on clinical histories, histopathology findings, radiographic findings, bronchoalveolar lavage results, genetic testing, and other “biological investigations” (i.e., lab testing).