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Introduction: Regulatory disorders (RDs) are manifested by sensorimotor, sleep, feeding and adaptation abnormalities in the first three years of life, which seem to indicate future child development problems. There is evidence that RDs are related to attention, learning and behavioral problems that are observed at school age. Therefore, it is important to invest in resources that enable their early detection. The objective of this study was to describe the process of creating a questionnaire to detect atypical behavior suggestive of RDs, among 6 to 12-month-old infants. Method: The instrument was developed in two stages: (a) planning and constructing the test and (b) content validity examination through an expert panel consisting of researchers and professionals with recognized experience in the field. Results: The data indicated that the topic is relevant and that, according to the scores from the panel, the items in the questionnaire are easily observed (96.8%), clearly written (94.5%), assess important aspects of behavior (89.6%) and can potentially detect atypical behavior in 6 to 12-month-old infants (85.4%). Conclusion: Based on this study, the items were reviewed, resulting in a questionnaire with 50 items that will be applied experimentally in future work. It is expected that the questionnaire will be useful for early detection of problems that affect a great number of children.