According to my parent, it was quite the opposite for my brother and I, but I'm undiagnosed... I didn't have a language delay at all, I've talked pretty early and "well" (better than my brother though I have dyspraxic and dyslexic traits). I'm not sure I used typical words for my age though because I've always tended to use "adult language" but that mostly because my parents didn't talk to us in "baby language".
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Yeah, I did that too. I was probably a bit older, maybe 7 or 8. I even tried to make up my own language. My mum thought I was pretending to be an alien.
I did that too ! I was always trying to create my own language when I was little, it started pretty early. At some point, when I was 7/8, I even created myself an imaginary friend who lived on the dark side of the moon (because I loved astronomy) I didn't share with my brother so that I could claim this language exist somewhere. I know many kids who did that, most of the time they were pretending to speak a real language (ie English as I'm French)