1. We are born with the ability to gesture, and not something that is learned directly. So it is a in-born trait. You get the ability of speech, and gesturing tags along. (but most likely, evolutionary speaking, gesturing came first).
2. Gesturing is linked to speech/language. Different languages will have different gestures, not because they learned them, but by the grammatical structure/intonation of the language.
It will have been interesting to see multi-lingual people, and see if the level of gesturing changes when they switch language.
"The results showed that blind Turkish speakers gesture like their sighted counterparts, and the same for English speakers. All Turkish speakers gestured significantly differently from all English speakers, regardless of sightedness. This means that these particular gestural patterns are something that’s deeply linked to the grammatical properties of a language, and not something that we learn from looking at other speakers."