A study conducted by Penn State linguistic researchers showed that bilingual speakers likely develop a higher level of mental flexibility than those who only speak one language. Why? Because they are able to switch between languages seamlessly.
"In the past, bilinguals were looked down upon," said Judith F. Kroll, Professor of Psychology, Linguistics and Women's Studies at the university, in a statement. "Not only is bilingualism not bad for you, it may be really good. When you're switching languages all the time it strengthens your mental muscle and your executive function becomes enhanced."
Although it is often believed that young children will be confused by the exposure to more than one language, says Professor Kroll. The research conducted in this study shows that introducing two languages from birth enables children to recognize and distinguish speech in both languages.