In 3 experiments, the authors examined whether a single act of testimony can inform children's subsequent information seeking. In Experiment 1, participants saw one informant give a correct and another informant give an incorrect answer to a question, assessed who was "right" ("wrong"), and decided to whom to address a 2nd question. Adults and 7-year-olds but not 4-year-olds selected the previously correct informant. In Experiment 2, after assessing which informant was ("not") "very good" at answering, even 4-year-olds selected the previously correct informant. In Experiment 3, in the absence of external demands to evaluate the informants, 7-year-olds and adults still selected the previously correct informant. Thus, a single encounter is sufficient for 7-year-olds and adults to engage in selective information seeking and trait labels enable 4-year-olds to do so too. (Contains 1 table.)