The ability of young infants to make fine discriminations between sounds is particularly important in the development of their ability to understand "Language."
At 6 months, the monolingual newborn children could segregate between phonetic sounds, regardless of whether they were expressed in the dialect they were accustomed to hearing or in another dialect not talked in their homes. By 10 months to a year, notwithstanding, monolingual infants were never again recognizing sounds in the second dialect, just in the dialect they typically heard.
The analysts proposed this speaks to a procedure of "neural commitment," in which the baby mind wires itself to comprehend one dialect and its sounds.