My 23 month old refuses to talk

His pediatrician doesn’t seem concerned yet but I feel stressed because my 23 month old only says 6 words at most . He copies noises like when you drink water and do that “ahh” sound. He mimics the hungry caterpillar smacking his lips and snoring, he howls like the dogs do. But the only word he ever actually says is dada . When he cries he says “mum” . He understands what I mean when I talk to him like asking if he’s hungry he’ll smile at me and smack his lips and if I ask him to lay down he’ll go to the bed and lay down and tuck himself under the blanket to her comfy. If I ask him if he wants to see grandma or go downstairs he understands or when I tell him to show me where the puppies are he shows me where they are. He tries singing but it’s mainly babbling and him trying to form the words but not quite there. I don’t know how to encourage him to speak more. I’m a bit worried, my mom has told me that I didn’t start talking until after I turned 2 so I’m hoping that’s the case for my son too but idk.

Any advice ? Has your little ones gone through this ? I read to him sing to him and talk to him normally but I’m not sure if I can help him in any other way or if it’s just one of those things he’ll eventually get to on his own.