Researchers at the University of Washington say they are looking for 16 11 month old babies, half of them from bilingual families and the other half of them live with only one language.
The researchers listened to 18 minutes of speech recordings, using specially designed headphones to record the changes in brain neurons as they listened.
The results showed that the prefrontal cortex and orbitofrontal cortex of bilingual babies had obvious responses when they listened to the recordings.
These two parts are responsible for the executive function of the brain, which is the "central control room" of the brain, commanding the operation of other parts of the brain.
The development of these two parts means that the baby's learning ability, problem-solving ability and memory are stronger.
Naya Ramirez, who led the study, said: "the results show that children who grow up in a bilingual environment, even if they can't speak, have gained exercise in brain executive function.
In other words, bilingual environment not only promotes language development, but also promotes cognitive ability