For years, scientists and parents alike have touted the benefits of introducing babies to two languages: Bilingual experience has been shown to improve cognitive abilities, especially problem-solving. And for infants raised in households where two languages are spoken, that bilingual learning happens almost effortlessly. But how can babies in monolingual households develop such skills? “As 91×ÔÅÄers studying early language development, we often hear from parents who are eager to provide their child with an opportunity to learn another language,…