B.
Why wait? If it is a hearing problem - you can get that corrected early. If it's not a hearing problem, then you know that as well. My son didn't talk AT ALL until we started getting speech therapy....I had an evaluation through my local school district, and their early intervention program supports his speech therapy. Additionally, you could contact 1-800-earlyon (of MI) for a consultation. Please keep in mind that the options I'm giving you for speech evaluation are FREE and that early intervention is best! Good luck.