(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

I was raised bilingual (my first words were in Spanish).

They are two different languages. I understood this at 3. I spoke English with some people and Spanish with others.

Now, do they get mixed up en mi cabeza? Of course! I forget words in both languages. There are days when I bumble in English and am fluent in Spanish and vice-versa.

This was one of the most valuable gifts I was ever given. And so I have given the same gift to my son.