To not want my daughter spoken to like an idiot?

[Wingebag]

My dd has just turned 1. She has a few words but understands a lot of what we say to her.

MIL came over today "shall we go for a walk walky walkies?". I has to restrain myself from saying "no, but you could go for a walk". This isn't out of the norm for her, everything she says to my dd is in ridiculous baby talk. I always speak to her in a soft tone, but with normal words. AIBU to request that MIL stops the baby talk (y-walky-talky) now as she will be picking up on it?

Yabu. Vu. Language development research is clear about the evolutionary basis of child directed speech. It's how we learn language.

I suspect the problem is more about how irritating you find your mil.