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?


Yes, to an extent, but I don’t think it has to do with grammar as much as pronunciation. Norwegian (bokmål) and danish are almost indistinguishable when written down, but spoken Danish is pronounced very weirdly (a lot of swallowed and mumbled consonants that causes it to sound like the speaker has gotten drunk on their way back from getting a root canal and is currently struggling to eat a hot potato). Despite Norwegian having a massive range of regional dialects, Norwegian kids learn to speak a lot quicker than danish kids. Largely because danish kids just don’t understand what they’re hearing for longer. The Danes have to subtitle their own TV programmes because they don’t really understand each other. It’s a fucking mess. Norwegian kids understand Swedish before danish kids understand danish.
Here is a short documentary on the danish language
It sounds like what you said is a joke, but just wanted to underline that this has even been subject to scientific study, e.g. mentioned here: https://theconversation.com/danish-children-struggle-to-learn-their-vowel-filled-language-and-this-changes-how-adult-danes-interact-161143
This answers exactly what I was asking, thanks!
Also I remember reading a newspaper account of a danish supermarket that actually ordered 1000 litres of milk by mistake. And everyone in Norway found it hilarious, because it happened after the sketch was aired.
Apparently it’s happened a couple of times
No one mention the Norwegian butter crisis!
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.
Like learning Norwegian (bokmål) while living on the west coast. French vocal r, secondary Norwegian language, one hour travel north or south can be regarded as a completely new language. Nice fjords, though.