Purpose: This study presents evidence that gesture is a means to understanding the semantic representations of toddlers. Method: The data were part of a study of toddlers' word learning conducted by N. C. Capone and K. K. McGregor (2005). The object function probe from that study was administered after 1 exposure and after 3 exposures to objects. Here, toddlers' gestures were described and their gesture-speech combinations were analyzed as a function of instruction and time. Results: A large proportion of toddlers gestured. Gestures were iconic and deictic, but toddlers produced more iconic gestures than previously reported. Consistent with studies of older children, toddlers produced gesture-speech combinations that reflected their learning state. Conclusion: Gesture can be both a source of semantic knowledge and an expression of that knowledge. Gesture provides a window onto evolving semantic representations and, therefore, can be one method of assessing what a child knows at a time when oral language skills are limited and are, perhaps, an unreliable indicator of what the child knows. Embodied knowledge may underlie the use of gesture. Clinical implications are discussed.