The dual language program offers your child the chance to develop communication ability in Spanish and English. This could be difficult at first, but being bilingual may enhance your child’s potential opportunities (jobs, culture, etc).
Acquisition of language by children has been studied widely. Children have advantages over adults in language learning. Natural curiosity and a willingness to make mistakes help the child. Adults often hesitate when speaking another language for fear of erroneous pronunciation or grammar. Children, especially young children, tend not to have that fear.
Children easily pick up and model accents. Few adults who learn other languages pick up the correct accents. Many children do to the point at which they pronounce as well as a native speaker. Of course, those children generally start to learn the language before their teens with the help of native speakers.