While it is established that parental "wh"-questions, as a high-quality language input, are associated with child language outcome, less is known about the role of children's "wh"-questions in their language development. This study examines whether children's "wh"-questions during a dinnertime conversation are associated with their receptive and expressive language skills. The sample consists of a unique group of bilingual children: 32 Chinese preschoolers (aged 3-5 years) in Norway. At the onset of the study, parents self-recorded a dinnertime conversation with the target child and other family members present. Over the following year, we assessed children's receptive vocabulary, expressive vocabulary, and narrative skills in Chinese three times. Individual growth modeling revealed that concurrently, the density of children's "wh"-questions was associated with children's expressive vocabulary and narrative skills, but the association faded when controlling for family demographics. Significantly, even when accounting for all control variables, children's "wh"-questions predicted their receptive vocabulary growth across one year. These findings underline children's active role in shaping their language learning and development. This study also contributes to our understanding of bilingual children's home language development. Implications and directions for future research are discussed.