This study examines the role of lexical frequency in children's acquisition of liaison. The influence of parental input on the acquisition of liaison is investigated. Two factors are hypothesized to play a role in the acquisition of liaison: first, the frequency of the left word (Mot1); second, the frequency of the right word (Mot2). This study is based on the analysis of two corpus of a little girl. It will not be a question here of propose general facts. The objective of this work is to propose hypotheses which must be verified by the analysis of other corpuses.