De Houwer (language acquisition and teaching, U. of Erfurt, Germany) offers this supplemental text for classes in bilingual first language development. The six chapters discuss the theoretical fundamentals behind the development of two languages from birth through four longitudinal case studies of bilingual children, beginning in infancy and concluding around age six. Considerations for bilingual education are addressed in the conclusion. Annotation ©2009 Book News, Inc., Portland, OR (booknews.com)