It is common for young simultaneous bilinguals to be more proficient in one language than the other, and this is probably related to each child's relative exposure to each language; for example, many bilingual children are more proficient in the mother's than the father's language, arguably because their mothers assume most of the childcare responsibilities and/or simply spend more time with their children.
這是常見的年輕雙語同時要在比其他一種語言比較精通，這可能與每一個孩子的親屬接觸到每種語言;例如，許多雙語兒童都是在母親的比父親的語言比較精通，可以說是因為他們的母親承擔大部分照顧孩子的責任和/或乾脆花更多的時間與自己的孩子。