In this study, we investigated the concurrent
and longitudinal relationships between vocabulary and
word reading across Spanish and English. One hundred and
seventeen 4- to 5-year-old Spanish–English bilingual
children attending Head Start programs in the United States
were tested for their Spanish and English word reading
twice, 5 months apart. We also tested the children’s
Spanish and English vocabulary and phonological awareness at Time 1. We used multiple regression models to
examine the predictive value of vocabulary to word reading
cross-linguistically and longitudinally. Results showed that
within (Spanish or English) language and concurrent predictions were stronger than cross-language and longitudinal
predictions; however, Spanish vocabulary was a significant
and unique predictor of English word reading longitudinally. Spanish phonological awareness also played an
important role in the relationship between vocabulary and
word reading. Our results suggest that helping Spanishspeaking children build their Spanish vocabulary can also
improve their English word reading ability.