Your brain remembers things you learned as a baby. A study of girls aged 9-17 showed that, despite being adopted from China as infants, those who grew up speaking French had the same brain activation patterns when listening to the Chinese language as those who’d spoken both languages since birth. However, French speakers who’d never learned Chinese had an entirely different reaction- suggesting that ‘early experiences unconsciously influence neural processing for years, if not indefinitely.’ Source Source 2