You need to get him around adults and other children who sign fluently. I know that you don't know ASL yet, neither did we. You need to have your IFSP goals say something like "Family will learn and use 20 new sign per week". You need to find Deaf adults and interact with them so your language can grow quickly, and your child can have access to fluent signers. Do you have a Deaf community center in your area? They will have free ASL classes. Also, a community college will have introductory ASL classes as well. I found them to be a great way to learn. Also, "Signing Time" video are quick and you can watch them with your son as well. They each have at least 20 new signs in them, and I believe there are 15 or more videos.
And seriously, you need to accept that MANY deaf people never learn to speak, I'm sorry that no one ever told you this, but it is a fact. I'm sorry that it is difficult for you and that you want your child to be successful in all areas, but are you being realistic? He is already passing the prime time for language learning and you say that he is appropriatly aided and has been in early intervention and had therapy, but it hasn't worked....isn't that telling you something?
