As someone who grew up bilingual, I don’t get this either. (Technically, since I grew up in Ireland, we also learned Irish in school, so three language, except

As someone who grew up bilingual, I don’t get this either. (Technically, since I grew up in Ireland, we also learned Irish in school, so three language, except we never spoke Irish outside of school) We never got confused! Having said that, you do need to use all languages enough to get proficient at each of them.