S.L.
My son was a late talker, so I read a lot on the subject. Get the video Baby Babble, it's very good, gives parents a lot of advice. Every time my son learned a sign for a word, he started saying the word within a week. so sign language is great! If he is making a lot of noise that's great, mine was very quiet. Work on fun stuff like animal sounds and car sounds and fire truck sounds with him, "boom" "PoP!" "YEAH!" so it's play, not "schooling". See if he picks up fun sounds and a few signs. My therapist taught him the signs and then the words for please and thank you. I thought, do we care if he's polite yet? But then he could use please for EVERYTHING he wanted, pointing and signing or saying please, then respond appropriately with Thank you, so it got him using language throughout the day, taught him the importance of using language consistently, so it was Very worthwhile. If you don't see a lot of growth going on, then get him evaluated, despite pediatrician. He should have at least six words and being using lots of consonants in his babbling right now. Early intervention is great, easy to get, and very low cost only until age three, and it will take a few months to schedule and evaluate so dont wait too long.