Is the ability to acquire language innate or learned?

The ability to acquire language is innate. I have a few baby relatives that i saw over break whom are all just starting to learn how to speak. Babies do not learn English because they have been taught how, they learn English because it is natural for them to do what they see around them. Also peoples ability to learn language changes depending on the person, just like all other things. Some people may be good at language but bad at math. Others may be good at math but bad a language. For some people it doesn't matter if you work really hard at a language, to some people it will just be easier. This is why some people know many languages and others know only one. I admit that this has to do with experiences, but a baby has no experience with language except for other people speaking it, yet still learns a language. This is why the ability to acquire language is innate.