?ideas to make eeee sounds

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Listmates:

I do not post to this groups much but my son is very apraxic and I

noticed he can make all the up and down sounds but can not make

sounds like eeee. I have been trying to have him make a smile, say

cheese(an approximation). It is so hard for him. Any ideas on how

to get these mouth positions. Jack is 5.

Thanks,

nne