Speech delay child

My son is 2 years old and we’ll be bringing him to see a speech therapist at KKH. He can call papa and mama but only when he feels like it. He can shout and babbles alot which I feel that he’s trying to talk but he just can’t form actual words. I try to reduce tv/ipad time and talk to him normally (not using baby terms) and read to him. They mimic the people/ environment around them. If they come into contact with very quiet or little human interaction or a constantly shouting/arguing background, I believe it’ll more or less impair their speech.