Just wondering.

My son is 3 years old. He does not talk. He will say certain words maybe 5 or 6 different words but that's it. My dad says he has caught him talking up a storm when he thought he was alone in the play room but as soon as he seen my dad he stopped. He had tubes placed last year and had 2 hearing test done and was told he could hear just fine and doctor said he didn't see the need for tubes but since he wasn't talking we would do that to see if it helped him. I have people coming at me from both sides. Some saying there is something wrong with him and he needs help and some saying he is fine he'll talk when he's got something to say. I've made an appointment with his doctor to see about getting a referral to a speech therapist but I just wanted to see if anyone else has dealt with this and how things are going now?