My 2.7 year old sweet son, Lance, has been diagnosed with apraxia. We have been doing speech therapy for 8 months, first at twice per week and then at four times per week, with minimal progress. He can put two words together but most words are tough to understand. Can someone please give me the dosage recommended by a doctor? I read Dr. Agin's book but it doesn't recommend dosage. He is about 27-28 pounds. my email is firstname.lastname@example.org and I am very grateful for any insight or suggestions.