"I’m a little worried because he’s two and he’s not talking yet. Everyone is telling me that he should be talking, and I see other babies imitating and having little conversations. But he’s only two, so we’ll give it another year."
As a speech pathologist major please please please tell him to get his son checked out, by a good speech-language pathologist. It might be bad, it might be good, but better safe than sorry. This stuff matters.