Have you tried teaching your child to sign? Vocalization is hard and a lot of the mechanics are hidden, so children can take a while to figure out how to produce sounds even if they understand them.
EDIT: Not as cool as Gr1mm’s source, but this might be helpful:
[https://www.thebump.com/a/how-to-teach-baby-sign-language](https://www.thebump.com/a/how-to-teach-baby-sign-language)
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