Bilingualism doesn’t contribute to speech delays, research shows. Bilingual children may say their first words slightly later than children who speak only one language, but within about the same age range of 12 to 15 months. If your baby is being raised in a bilingual home, they aren’t any more likely than monolingual babies to have difficulties with language learning. Early on, bilingual children often know fewer words in each of their languages than children who only speak one language—for example, an English-Spanish speaking child may know fewer words in English than a child who only speaks that language. But when you count words across both languages, bilingual children commonly know about the same number of total words as their monolingual peers. They also tend to develop grammar along the same patterns and timelines as monolingual children.