(ELI5) when babies are raised with bilingual families, are they learning it as just one jumbled language, or as two separate languages?

Question

Also would it become difficult to discern and seperate them when they join school for example, and interact with people that only speak one

In: 37

Answer 1

Research indicates that babies are more likely to pay attention when there is a change in the sounds they hear. If someone speaks one language then switches to another language, a baby will tend to react upon hearing words in a second language. This makes it seem likely that babies can distinguish between separate languages well before they’re able to talk.