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Objectives: This study proposed a version of the Children's Sleep Habits Questionnaire for infants under 12 months (CSHQ‐I). Methods: The sample was comprised of 299 infants, aged between 2 weeks and 12 months. Results: Exploratory factor analysis revealed four subscales: Bedtime Resistance, Sleep Anxiety, Positive Sleep Habits, and Daytime Sleepiness. The CSHQ‐I total scale presented good test‐retest reliability and internal consistency. The CSHQ‐I also showed good concurrent validity, with significant associations found between the CSHQ‐I total scale and subscales and a measure of infant sleep‐wake behaviors. Conclusions: The present study suggested the CSHQ‐I as a reliable instrument to assess sleep problems in infants during the first year of life.