My son stopped talking suddenly.

My son is 20 months old. I was at my native for few months due to my health. We have 5 people there.He used to talk lot, show things in books if we ask something, dance, sing etc when he was 13 months old. I came to my house when he was 17 months old. After coming here 15 days he was ok but suddenly he stopped talking, not responding if we call him, doesn't show interest in books or toys. He was on so much screen time after coming here compared to my native. He stopped calling me Amma also few days and never used to call his father. After we cut down screen time completely he is little ok like calling his father as daddy, few other words but doesn't respond much if we call his name, we need to call many times, if he is in good mood he will respond quickly otherwise no. Should I visit to developmental peadiatrician to rule out any issues. I am looking someone from Bangalore.