The Kauffman Center is the premier center for treating children with apraxia in the United States. Families routinely fly in from all parts of the country to at least get short term, intensive therapy for their apraxic children. It is expensive and requires the whole family to sacrifice dramatically. She also has the highest success rates in the country for working with apraxic children. The website for her center is here http://www.kidspeech.com/
My son was diagnosed with apraxia when he was two, on top of a lot of other things. When they told me he might never talk it was the first time in two years of never-ending medical issues that I burst into tears. I was in the grocery store and he stared up at me silently and I just burst into tears. I was devastated.
I mention the Kauffman center and I *know* that not everyone will be able to figure out how to borrow 10,000 dollars and fly themselves out there for three months. But, her center sets the standard of care for successful outcomes with apraxia, and one can use them as a resource for creating a successful program in their home area (which is what they do after short term intensive therapy to transition you home).
The gold standards of apraxia treatment are threefold: 1.) The therapist must have specific experience in working with apraxic children 2.) Therapy MUST be 1:1 to be effective, NO group therapy 3.) Therapy must be intensive, ideally five times a week.
Looking at my son now at six, you would never know he ever had a speech problem. The only signs are more subtle (difficulty with reading/dyslexia and some fumbling with words when excited). The progress he made using the Kaufmann approach was nothing short of amazing.
As an aside, my oldest daughter is 8 and has multiple disabilities due to prematurity. She did not utter her first word until she was 5 1/2. I remember the research I did at the time basically indicated that a child who talked before the age of 7 could and would progress and could "catch up" to peers over time, but a child who wasn't talking by 7 had a 90% chance of never speaking. So, for those years I used "7" as my magic number and tried to tell myself I wouldn't stress until she hit 6. (And of course, I'm a mother, so I did stress and worry about it, but that's what I tried to tell myself!)