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A bilingual–monolingual comparison of young children's vocabulary size: Evidence from comprehension and production



It is often assumed that young bilinguals are lexically delayed in comparison to monolinguals. A comprehensive comparison of comprehension and production vocabulary in 31 firstborn bilingual and 30 matched monolingual children fails to find empirical foundation for this assumption. Several raters completed Dutch and French adaptations of the MacArthur Communicative Development Inventories for children aged 13 and 20 months. At 13 months, bilinguals understood more words than did monolinguals; at 20 months, monolinguals knew more Dutch words than did bilinguals (combining comprehension and production). There were no group differences for word production or for Dutch word comprehension. Both groups understood and produced the same number of lexicalized meanings; ratios of word comprehension to word production did not differ; interindividual variation was similar. This study underscores the importance of conducting bilingual–monolingual comparisons with matched groups and suggests that if individual bilingual children appear to be slow in early vocabulary development, reasons other than their bilingualism should be investigated.


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ADDRESS FOR CORRESPONDENCE Annick De Houwer, Sprachwissenschaft, Erfurt University, Erfurt D-99089, Germany. E-mail:


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Águila, E., Ramon, M., Pons, F., & Bosch, L. (2005). Efecto de la exposición bilingüe sobre el desarrollo léxico inicial. In Mayor Cinca, A., Zubiauz de Pedro, B., & Díez-Villoria, E. (Eds.), Estudios sobre la adquisición del lenguaje. Salamanca, Spain: Universidad de Salamanca.
Águila, E., Ramon-Casas, M., Pons, F., & Bosch, L. (2007). La medida del léxico productivo inicial: Aplicación de un cuestionario para la población bilingüe. In Diez-Itza, E. (Ed.), Estudios de desarrollo del lenguaje y educación (Vol. 32). Oviedo, Spain: ICE Monografias de Aula Abierta.
Baldwin, D. A., & Moses, L. J. (2001). Links between social understanding and early word learning: Challenges to current accounts. Social Development, 10, 309329.
Barreña, A., Ezeizabarrena, M.-J., & García, I. (2008). Influence of the linguistic environment on the development of the lexicon and grammar of Basque bilingual children. In Pérez-Vidal, C., Juan-Garau, M., & Bel, A. (Eds.), A portrait of the young in the new multilingual Spain: Issues in the acquisition of two or more languages in multilingual environments. Clevedon: Multilingual Matters.
Bates, E., Dale, P., & Thal, D. (1995). Individual differences and their implications for theories of language development. In Fletcher, P. & MacWhinney, B. (Eds.), Handbook of child language. London: Blackwell.
Bialystok, E., Craik, F. I. M., Green, D. W., & Gollan, T. H. (2009). Bilingual minds. Psychological Science in the Public Interest, 10, 89129.
Bialystok, E., Luk, G., Peets, K., & Yang, S. (2010). Receptive vocabulary differences in monolingual and bilingual children. Bilingualism: Language and Cognition, 13, 525531.
Bornstein, M. H., Hahn, C.-S., & Haynes, O. M. (2004). Specific and general language performance across early childhood: Stability and gender considerations. First Language, 24, 267304.
Bornstein, M. H., Putnick, D. L., & De Houwer, A. (2006). Child vocabulary across the second year: Stability and continuity for reporter comparisons and a cumulative score. First Language, 26, 299316.
Bridges, K., & Hoff, E. (2008). The role of siblings in the English language development of bilingual toddlers in the U.S. In Chan, H., Kapia, E., & Jacob, H. (Eds.), A supplement to the Proceedings of the 32nd Boston University Conference on Language Development. Boston: Cascadilla Press.
Clark, E. V. (1993). The lexicon in acquisition. Cambridge: Cambridge University Press.
Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Erlbaum.
De Houwer, A. (1990). The acquisition of two languages from birth: A case study. Cambridge: Cambridge University Press.
De Houwer, A. (2006). Bilingual development in the early years. In Brown, K. (Ed.), Encyclopedia of language and linguistics (2nd ed.). Oxford: Elsevier.
De Houwer, A. (2009). Bilingual first language acquisition. Bristol: Multilingual Matters.
De Houwer, A. (2010). Assessing lexical development in bilingual first language acquisition: What can we learn from monolingual norms? In Cruz-Ferreira, M. (Ed.), Multilingual norms. Frankfurt: Peter Lang.
De Houwer, A., Bornstein, M. H., & De Coster, S. (2006). Early understanding of two words for the same thing: A CDI study of lexical comprehension in infant bilinguals. International Journal of Bilingualism, 10, 331347.
De Houwer, A., Bornstein, M. H., & Leach, D. B. (2005). Assessing early communicative ability: A cross-reporter cumulative score for the MacArthur CDI. Journal of Child Language, 32, 735758.
Doyle, A., Champagne, M., & Segalowitz, N. (1977). Some issues in the assessment of linguistic consequences of early bilingualism. Working Papers on Bilingualism, 14, 2130.
Fenson, L., Dale, P., Reznick, J. S., Bates, E., Thal, D., & Pethick, S. (1994). Variability in early communicative development. Monographs of the Society for Research in Child Development, 59(5, Serial No. 242).
Fenson, L., Dale, P., Reznick, S., Thal, D., Bates, E., Hartung, J., et al. (1993). MacArthur Communicative Development Inventories: User's guide and technical manual. San Diego, CA: Singular.
Genesee, F. (2007). A short guide to raising children bilingually. Multilingual Living Magazine, January–February, 1–9.
Hart, B., & Risley, T. (1995). Meaningful differences in the everyday experiences of young American children. Baltimore, MD: Paul Brookes.
Hoff, E., Core, C., Place, S., Rumiche, R., Señor, M., & Parra, M. (2012). Dual language exposure and early bilingual development. Journal of Child Language, 39, 127.
Hoff-Ginsberg, E. (1998). The relation of birth order and socioeconomic status to children's language experience and language development. Applied Psycholinguistics, 19, 603629.
Hollingshead, A. B. (1975). The Four-Factor Index of Social Status. Unpublished manuscript, Yale University.
Jackson-Maldonado, D., & Bates, E. (1988). Inventario del desarollo de las habilidades communicativas. San Diego: University of California, Center for Research on Language.
Jackson-Maldonado, D., Thal, D., Fenson, L., Marchman, V., Newton, T., & Conboy, B. (2003). El inventario del desarollo de las habilidades communicativas: User's guide and technical manual. Baltimore, MD: Paul Brookes.
Junker, D., & Stockman, I. (2002). Expressive vocabulary of German–English bilingual toddlers. American Journal of Speech–Language Pathology, 11, 381394.
Kern, S. (2007). Lexicon development in French-speaking infants. First Language, 27, 227250.
Kern, S., & Gayraud, F. (2007). Influence of preterm birth on early lexical and grammatical acquisition. First Language, 27, 159173.
Kern, S., & Gayraud, F. (2010). L'inventaire français du développement communicatif. Grenoble: La Cigale.
King, K., & Mackey, A. (2007). The bilingual edge: Why, when, and how to teach your child a second language. New York: HarperCollins.
Lee, J. (2011). Size matters: Early vocabulary as a predictor of language and literacy competence. Applied Psycholinguistics, 32, 6992.
Marchman, V. A., & Martínez-Sussmann, C. (2002). Concurrent validity of caregiver/parent report measures of language for children who are learning both English and Spanish. Journal of Speech, Language, and Hearing Research, 45, 983998.
Meisel, J. (1989). Early differentiation of languages in bilingual children. In Hyltenstam, K. & Obler, L. (Eds.), Bilingualism across the lifespan: Aspects of acquisition, maturity and loss. Cambridge: Cambridge University Press.
Oller, D. K., Pearson, B. Z., & Cobo-Lewis, A. B. (2007). Profile effects in early bilingual language and literacy. Applied Psycholinguistics, 28, 191230.
Pearson, B. Z., Fernández, S., Lewedeg, V., & Oller, D. K. (1997). The relation of input factors to lexical learning by bilingual infants. Applied Psycholinguistics, 18, 4158.
Pearson, B. Z., Fernández, S., & Oller, D. K. (1993). Lexical development in bilingual infants and toddlers: Comparison to monolingual norms. Language Learning, 43, 93120.
Pérez-Pereira, M., Resches, M., & Fernández, P. (2006). Differences in language development between monolingual (Galician) and bilingual (Galician-Spanish) children. In Eriksson, M. (Ed.), Proceedings from the First European Network Meeting on the Communicative Development Inventories. Gävle, Sweden: University of Gävle.
Rimel, A., & Eyal, S. (1996). Comparison of data on the lexical knowledge of bilingual vs. monolingual toddlers collected by their parents, using the MacArthur Communicative Development Inventory (CDI). Speech and Hearing Disorders, 19, 212219.
Song, L., Tamis-LeMonda, C. S., Yoshikawa, H., Kahana-Kalman, R., & Wu, I. (2012). Language experiences and vocabulary development in Dominican and Mexican infants across the first 2 years. Developmental Psychology, 48, 11061123.
Swain, M. (1972). Bilingualism as a first language. Unpublished doctoral dissertation, University of California.
Thordardottir, E., Rothenberg, A., Rivard, M.-E., & Naves, R. (2006). Bilingual assessment: Can overall proficiency be estimated from separate measurement of two languages? Journal of Multilingual Communication Disorders, 4, 121.
Tsao, F. M., Liu, H. M., & Kuhl, P. K. (2004). Speech perception in infancy predicts language development in the second year of life: A longitudinal study. Child Development, 75, 10671084.
Vagh, S. B., Pan, B. A., & Mancilla-Martinez, J. (2009). Measuring growth in bilingual and monolingual children's English productive vocabulary development: The utility of combining parent and teacher report. Child Development, 80, 15451563.
Zink, I., & Lejaegere, M. (2002). N-CDIs: Lijsten voor communicatieve ontwikkeling—Aanpassing en hernormering van de MacArthur CDIs van Fenson et al. Leuven: Acco.

A bilingual–monolingual comparison of young children's vocabulary size: Evidence from comprehension and production



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