Bilingualism and Language Delay?

As a Manhattan-based speech - language therapist, half of my caseload typically contains children speaking two or even three languages.

Parents of bilingual children are often concerned that they have fostered a language delay. This is particularly pressing when their toddler doesn't seem to be using as many words, or is not speaking using the complex sentences of their peers.

As De Houwer (1999) summarizes, "There is no scientific evidence to date that hearing two or more languages leads to delays or disorders in language acquisition. Many, many children throughout the world grow up with two or more languages from infancy without showing any signs of language delays or disorder".

http://www.sayandplayfamily.com/2010/01/bilingualism-and-language-delay.html