J.V.
Is this where their tongue tends to not always be where it should be with trying to say words... It has been over 30 years since my daughter had speech problems...the Apraxia seemed to ring bells in my head... If that is indeed his problem... He will do great... get a good speech therapist. We started my daughter with a speech therapist when she was about three or three and a half and continued for several years... But when she entered school and found out that she was seeing a speech therapist.. they said WHY (by that time she and the speech therapist were friends and the rate this lady charged was very little .... so they continued till the Speech Therapist moved when she was in lst grade. The Therapist made up fun things for her to do to help her tongue be where it needed to be.. and showed her where her tongue should be with various words and had her practice before a mirror... Worked well.. Blowing Bubble with the will bubble blower was another practice thing she did.
Good luck.
J.