목적: The Lombard effect is an involuntary response of speakers experience in the presence of noise during voice communication. The aim of this study is to investigate the Lombard effect by comparing the acoustic features in children and adults under different listening conditions. 방법:Nine male children (5-9 years old) and 12 young adult men (24-35 years old) were recruited to produce speech in three different listening conditions (quiet, noise-55 dB, noise-70dB). Acoustic analyses were then carried out to characterize their acoustic features, such as F0, intensity, duration, and vowel space area, under three listening conditions. 결과:The Lombard effect was observed in intensity and duration of children and adults who participated in this study in adverse listening conditions. However, we did not observe the Lombard effect in the F0 and vowel space area of the two groups in this study. 결론:These findings suggest that children can modify their speech production in challenging listening conditions compared to adults.