This patient support community is for discussions relating to Speech and Language Disorders. Topics include, but are not limited to: Aphasia,
Apraxia,
Autism and Communication, Developmental Dyspraxia, Motor Speech Disorder, Orofacial Myofunctional Disorders, Paradoxical Vocal Fold Movement (PVFM),
Tongue-Tie (Ankyloglossia), Voice Disorders
You can also have him drink thick liquids through a straw (milkshake, thick smoothie, yogart, even applesauce--- my son's favorite!) He can do the opposite, blow through a straw (bubbles into a cup, a cotton ball across the table---- cut the straw at first as this is easier). Lick a lolliepop, chew chewy things.
I would also say, "look at my mouth, this is how you say balloon." Then say it slowly for him so he can see how you hold your mouth when you say it.
Socially, you'll need to help more as this can make it a little tough communicating with peers. You don't want his confidence to dip, so just help more than you would ordinarily.
It sounds like your son's articulation is behind a bit (many kids are). Once he gets into public elementary school, they evaluate ALL kids for speech and provide speech therapy if needed.