Associate Professor Leher Singh, at the National University of Singapore conducted a study which looked at the effects of bilingualism in six-month-old infants. The study concluded that babies who are exposed to two languages have a better memory and are able to process information faster than monolingual infants. Infants have the capability to take on the challenges of bilingual acquisition as compared to adults. This long term study began in 2009 and was recently published in the journal Child Development in July of this year.
For more information on the study : http://www.a-star.edu.sg/Media/News/Press-Releases/articleType/ArticleView/articleId/3300.aspx