many babies do go through this.. it's common.. so relax.. just burp your baby properly.. and keep your baby in upright position for 15-20 mins..

After feed your son try to burping after every feed.....

<font color ="#3b5998"><b><a href="http://app.babychakra.com/article/1074">How should you Burp your Baby?</a></b></font> is a good read

After every feed burp burp atleast for 10 mins..

try to burp u r baby well