Dear doctor, my son is just turned 2 years on last 26th october17. But he is still babbling. Sometimes pronouncing mum mum, and sometimes unclear words. He express his needs by sign languages, like for water he will cough, and may point towards the bottle. He is selective in paying attention and has firm attraction towards digital gadgets. He is always found busy in his way. We have done hearing test, doctors says all ok. We are worried, please help!