No magic involved, they generally have a good understanding of how a computer functions which means they can relate a language directly 1:1 to what the computer is doing instead of relating it to what another language they already know does or by simple trial and error.
>No, toddlers pick up languages faster than adults because their level of brain development is more receptive to language acquisition.
Toddlers are in the 12-36 month range, they primarily mimic and use language on simple cause and effect terms, if I say this than this is the result. They do not understand the concept of language or languages and if you teach them with multiple languages they do not see them as separate languages they see them as a sound and a result. We develop those distinctions and understanding of meaning during childhood and adolescence.