Babies begin learning language from mums while in womb

Pregnant woman

Unborn babies listen to their mothers talk during the last 10 weeks of pregnancy and at birth can demonstrate what they've heard, researchers say.

Babies only hours old are able to differentiate between sounds from their native language and a foreign language, scientists have discovered. The study indicates that babies begin absorbing language while still in the womb, earlier than previously thought.

Sensory and brain mechanisms for hearing are developed at 30 weeks of gestational age, and the new study shows that unborn babies are listening to their mothers talk during the last 10 weeks of pregnancy and at birth can demonstrate what they've heard.

"The mother has first dibs on influencing the child's brain," Patricia Kuhl, co-author of the study from the Institute for Learning and Brain Sciences at the University of Washington, said.

"The vowel sounds in her speech are the loudest units and the fetus locks onto them," she said.

Previously, researchers had shown that newborns are born ready to learn and begin to discriminate between language sounds within the first months of life, but there was no evidence that language learning had occurred in utero.

"This is the first study that shows fetuses learn prenatally about the particular speech sounds of a mother's language," Christine Moon, lead author of the study from Pacific Lutheran University in Tacoma, Wash, said.

"This study moves the measurable result of experience with speech sounds from six months of age to before birth," Moon said.

Forty infants, about 30 hours old and an even mix of girls and boys, were studied in Tacoma and Stockholm, Sweden. While still in the nursery, the babies listened to vowel sounds in their native tongue and in foreign languages.

Their interest in the sounds was captured by how long they sucked on a pacifier that was wired into a computer measuring the babies' reaction to the sounds. Longer or shorter sucking for unfamiliar or familiar sounds is evidence for learning, because it indicates that infants can differentiate between the sounds heard in utero.

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