Thanks for the clarification, Victoria. I wasn't sure what Garry's role was, but I assumed it was similar to yours. Glad to know the difference.
Claire, please let you husband know that while his fears seem irrational, some of us (if not all) understand that immigration can be a scary, daunting thing. However, he's going to have this one chance to be with his child while his child is at this age. He'll never get this time back. Immigration officials don't care about that. They don't care if he never sees his son. However, there seems to be only one way for him to resolve this, and that is to allow a professional to help you guys, even if it's just advice and not in a formal capacity.
Right now, the constant refusals aren't doing any favours for your husband's chances to get into the UK though his own efforts. I hope for the best for the two of you, whether on your own or with the help of someone like Vicky. More than that, I hope the best for your son. Please let us know if you have any sucess, even if you don't go through the appeals or seek advice.
ETA: Glad to hear he's going to look at all his options.