5  fun activities that improve speech and articulation :

  1.  Blowing bubbles through straws  in different capacity containers.
  2.  Sucking   sugar-free lollipops.
  3. Blowing  different kinds of whistles . @talktool have a  wonderful assortment ( see photo).
  4. Bite down on baby chewing toys . ( like vibrating tethers ).
  5. Make tongue movements  :   Putting peanut butter on his lips so he had to use his tongue to lick it off  or  looking in the mirror while moving his tongue , and putting a sugar free M&M sized sweet in his mouth and  getting him to move it from side to side with his tongue.

 

Doing these activities on a daily basis is the key to success.