This project aims to investigate the role of phrasal prosody and function words to constrain the acquisition of noun and verb meaning by 18-month-old infants. Given that infants develop an extensive experience with prosody from birth and that the prosodic structure of sentences correlates with its syntactic structure, many theories suggests that infants might use prosody to bootstrap their way into syntactic acquisition. Here we examine this question by testing whether 18-month-old French children, who are still in the process of learning the syntax of their language, can use phrasal prosody as a cue to interpret a novel word as either a noun or a verb (depending on its position within the syntactic structure of the sentence), and therefore constrain their interpretation of the probable meaning of that novel word (mapping nouns to objects and verbs to actions).