Not being able to speak doesn't = not having language.
https://theconversation.com/babies-can-learn-language-sounds...
https://www.monoglotanxiety.com/blog/sciene-of-language-newb...
https://www.aaas.org/news/babies-brains-are-primed-their-nat...
I could go on for each of your claims but this should suffice to make a curious person want to revisit their assumptions. Each one touches not only on speech but memory.
You moved the goalpost in your second comment, so I am not going to consider you worth engaging beyond that - you're clearly a bad faith arguer.