This study coded (MAX) 10-month-old infants’ facial action responses to adult Negative (Disgust) and Positive (Happy) categories of facial expressions to explore the potency of negative over positive information. Infants either saw Positive adult expressions followed by Negative ones or vice versa. The infant responses were coded as they observed each expression category initially and as they observed each expression after the witnessing the oppositely valenced category. When the infants observed Negative stimuli beforehand, their responses to the following Positive stimuli were negatively skewed. Viewing the Positive category first was predicted not to alter the infants’ response pattern to the Negative stimuli that followed. Unexpectedly, these responses were also negatively skewed. The pattern of results is partially consistent with the effects associated with a negativity bias but also indicate influences associated with dishabituation/novelty effects. Thus, further research is needed to isolate the potency effects predicted by a negativity bias.