My child is being raised bilingual. Are his language skills delayed because he has a difficult time learning both languages simultaneously?

In NYC many families are bilingual or even trilingual. When a child is exposed to two (or more) languages, he/she should meet language milestones. Developmental rough patches may include mixing vocabulary and grammar from the multiple languages. There have been only a few children with whom I have worked where I discouraged two (or three) languages based on the type and severity of the language delay.