Child Age 4 years Boy not eating anythin

Sir, 1.   My son age 4 years not taking food. Every time we have to feed him forcely. In starting stage also he didn't drink milk from his mother. Bottle feeding during his sleep time only. When he was awake he used to refuse and vomit. Same thing happening now also. 2.  His mother used to feed him rice with sambaar, rasam or any liquid curry or curd.  "Basically he dont chew food". The movement she puts food, he immediately swallow it. Like that we are feeding him. Even banana also he dont chew. 3.  Now we are expecting second child.  But main fear we are facing is he dont eat food  not even  any fruit also. Doctor, Please advice how to make him to eat food his own and how to teach him to chew food.