In homes where parents are introducing their children to two languages, there are certain strategies that can be implemented to promote bilingual learning. One of these is the concept of one-parent-one-language. This is particularly useful in homes where parents have different native tongues. Say one parent is from the US and the other is from France. The idea is that the US parent will exclusively speak to the child in English. The other will exclusively speak to the child in French. This way, the child is exposed to both languages from an early age.
It’s important to balance bilingual learning.
If the child gains large exposure to English but only mildly exposure to French, they may develop the idea that English is the more important language. French, then, would be seen as secondary. To truly promote bilingual learning, getting the exposure closest to equal is a great move.