(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

My 2 cousins (3 and 6) have a French mum and English dad. They are able to speak to their mum in French, and then turn to me and say ‘oh my mum said xyz’ and translate it for me. Pretty crazy