I hold on to baby language. Often, I'm still using their early mispronunciations long after they outgrow them.
It wasn't log ago that I stopped using lellow on occasion, even though even Naomi is yelling at me: "it's yellow!"
I don't see any reason to push them toward correct pronunciation too soon, which is probably one of the reasons why Miriam, after showing verbal skills very early, has not moved beyong her peculiar Ewok launguage, which I parrot back to her (I say real words too, don't worry). She's an ewok now, in time she'll be an experienced communicator who can pronounce "I hate you, mom!" with all the icy venom of a surly adolescent, and I'll remember how all she used to say was "tikotiko sssttsssss tiko" and feel nostalgia for these simple days.
I'll drag it out for as long as I can, because no matter what I do, it won't last. Babyhood is so short.