When Sebastian Rios was a toddler, he hardly talked. “Don’t worry,” his pediatrician told Amparo and Victor Rios, Sebastian’s parents. Kids who grow up in households in which both Spanish and English are spoken are sometimes slower to develop language skills, she said. Plus, Sebastian was developing well in other ways: When he was just 18 months old, for example, he could identify the magnetized letters of the alphabet on the refrigerator at their home in Bronxville, a short train ride north of New York City. But by the time Sebastian was a little over 2 years old, his skills weren’t keeping u…
