Study in Italy Reports that Bilingual Infants can…

Claudia is the Endowed Joan Wieler Arno 49 Professor at…
http://www.sciencemag.org/cgi/content/abstract/1173947
When infants are given the opportunity to simultaneously learn two different regularities of language, bilingual infants learned both, while monolinguals learned only one of them. Hence, bilinguals may acquire two languages in the time in which monolinguals acquire one because they quickly become more flexible learners.
Also summarized in a Spanish newspaper:
http://www.latercera.com/contenido/657_153662_9.shtml
Los niños bilingües son más flexibles en el aprendizaje
Un estudio indica que los bebés de doce meses 'bilingües' son, petencialmente, aprendices más flexibles que los bebés monolingües, cuando se enfrentan a estímulos lingüísticos.
Claudia is the Endowed Joan Wieler Arno 49 Professor at Lasell University. She is currently a full professor of education and chair of the Education Program. Claudia has been a teacher, researcher, consultant, and professor of special education.