I saw Brad's pediatrician on Friday. It turns out the fluid in his ears is mild and, in all likelihood, very recent. So there's little likelihood that Brad's receptive/expressive language delay is caused by the fluid, rather than PDD. (I was hoping that the fluid had been there for 1+ year, in which case the hearing loss would cast doubt on the PDD diagnosis.)
I'm going to have a real dilemna if the fluid doesn't clear up on it's own. He may need surgery for tubes. Brad will be reexamined in 6 weeks.