Siegel, Pick, Olsen, and Sawin [Developmental Psychology12, 255–261 [1976)] found that young children decrease their vocal intensity less in response to sidetone amplification than adults. Perhaps when the child alters his vocal intensity, the acoustic cues accompanying the change differ from those available to the adult speaker. The present study was designed to determine whether the acoustic cues for vocal loudness and effort are the same in child and adult voices. The study is a replication of a study done with an adult speaker by Brandt, Ruder, and Shipp [J. Acoust. Soc. Am.46, 1543–1548 (1969)]. Children and adults repeated a sentence at seven intensity levels from 65 to 95 dB SPL. Adult listeners heard the sentences in a normal condition (as originally produced], with effort constant and intensity varying and with effort varying and intensity constant. Listeners rated the loudness and effort of each sentence. Preliminary results indicate that cues for loudness and effort are present in the speech of children as well as adults.