The potential role of a size scaling principle in orofacial movements for speech was examined using between-groups (adults vs. 5-year-old children) as well as within-group, correlational analyses. Movements of the lower lip and jaw were recorded during speech production, and anthropometric measures of orofacial structures were made. Adult females produced speech movements of equal amplitude and velocity to those of adult males. The children produced speech movement amplitudes equal to those of adults; but they had significantly lower peak velocities of orofacial movement. Thus we found no evidence supporting a size scaling principle for orofacial speech movements. Young children have a relatively large-amplitude, low-velocity movement strategy for speech production compared to young adults. This strategy may reflect the need for more time to plan speech movement sequences and an increased reliance on sensory feedback as young children develop speech motor control processes.