A dual immersion program in Chinese and English at the 3e International School in Beijing is helping children become fluent in both languages, even though many students spoke neither language when they entered the school. Children enter the program as young as two years old. Studies indicate that bilingual children have higher levels of cognitive flexibility than unilingual children, bilingual children become more aware of the meta-linguistic structures of language, and young children are fully able to handle bilingualism without becoming developmentally delayed in language. Dual language immersion programs must be carefully constructed and monitored and must provide best practice in skill building and language training.