I forgot to mention in my previous post that Silas has been saying one other "word" (actually two words) for some time before his language explosion. It's "Ah know," as in, "There, there, I know, little one." Apparently I say it so much to him that he started, sometime in the last several months, to say it himself.
One morning after a particularly bad night's sleep I was complaining to my friend Michelle about how crappy I felt. From the stroller Silas piped up, "Ah know." Michelle burst out laughing and said, "'I know, Mommy, you're tired.'"
Thanks for the sympathy, Bubby.