Like, English is a famously difficult language, and Spanish is supposed to be easier. But babies learn English or any language instinctually.
So do babies learn faster if the native language is easier, or do they acquire language at a constant rate depending on their brain development or whatever?
This has been my experience learning French. The written language and the spoken one are pretty wildly out of tune, with up to ~5 letters at the ends of some words either not pronounced at all, or heavily swallowed.
Learning the pronunciation of Castellano (i.e. a sister language) was vastly easier for me.