Our one year old son has about a 20-25 word vocabulary right now, which I guess is pretty good (at least according to our doctor), but our daughter by this age could say somewhere between 50-100 words. (Yes, I know she is a first born and a girl). It's hard sometimes to not make comparisons or worry, though.
He gets away with not having to say much because he points and grunts and first born daughter gets what he wants. Lately, I've been asking her to not do that so that he'll have to ask for something. So, yesterday they were playing and he starts his pointing and grunting and I watch to see what my daughter is going to do. She turns around and says, "Little man, you are going to have to learn to start talking. Tell me what you want." He shakes his head back and forth, says, "No!" and runs away.