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Parent-child interactions and parenting practices are crucial for the development of emotion regulation. Poor parenting competence, as sometimes seen in teenage mothers, could therefore constitute an important risk factor. To further investigate the development of emotion regulation in infants of teenage mothers, we observed their emotional expressions and regulatory behaviors during face-to-face interaction and when left alone at 4 and 10 months of age, and compared them to infants of adult mothers. Infants of teenage mothers showed more intense reactions at 4 months than infants of adult mothers, but less negative reactions when alone at 10 months, a possible sign of emotion inhibition. Differences were also found in the regulatory behaviors used and in their effects.