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Description: A long line of research investigates how infants learn the sounds and words in their ambient language over the first year of life, through behavioral tasks involving discrimination and recognition. More recently, individual performance in such tasks has been used to predict later language development. Does this mean that dependent measures in such tasks are reliable and can stably measure speech perception skills over short time spans? We addressed this question in 12 experiments (with a total of 409 paired data points), in which infants were tested in a given task, and retested within 0-18 days. Tasks ranged from vowel and consonant discrimination to recognition of phrasal units. Results reveal that great variation in reliability. In these supplementary materials, we provide further information on the studies, further analyses, and the raw data. SEE WIKI FOR DETAILS