At first consult pediatrician.

1st Find out his hearing ability because if child cant hear then also he cant speak 2nd Talk with him everyday observ his all developmental milestone and brain growth Encourage him for talk and short words

As per your statement about the baby Heis not speaking  and not giving proper response to you This is not any disease , don't worry.

Hi Your child seems to be under ASD. Please feel free to call & discuss more about him .

Hello madam. Please get your child checked for hearing.. May be there is a hearing problem. After the checkup, you can consult a good homoeopath. We can probably help your child. Good day

Consult nearest pediatrician

It is common cold U need ant histaminics And antibiotics

Some boys starts to speak late. As you described here, seems some abnormalities in hearing. Need to examine and detailed history

It doesn't seems to be normal. You should first consult pediatrician. I feel it's Attention deficit disorder. In this children are not over active. These symptoms are seen in youger age. But you should consult with pediatrician & confirm the dignosis. He is not talking at all? If he is talking small words then it's fine. Some children's talk late also. And doesn't get your instructions then check whether he doesn't have hearing problem? If it's ADD/ ADHD then he needs treatment.  For ADHD or other complaints Homoeoapthy has treatment to get rid of it & without any side effects.