Children's heuristics for word learning have been the focus of much research, but little is known about bilinguals' and monolinguals' comparative use of them. In this study, 36 Serbian/ English bilinguals and 42 English monolinguals, who were between 5 and 8 years old and lived in the same neighborhoods in the United States, received a successive name training assessment of two heuristics: criterial use of highlighted features and preservation of mutual exclusivity. Older children employed both heuristics more often than younger ones. Monolinguals were more likely than bilinguals to interpret a highlighted feature as a necessary condition for applying a new English object name, but the groups did not differ in their tendency to maintain mutual exclusivity between the extensions of two novel English labels.