sorry if this is a dumb question I'm a first time mom, but my son Is a month old about to be two, and hes been having a little flem and couch but i fed him and then burped him then I just started rocking him and I heard like something in his stomach, u know how if we drink to much water and move around we can hear it ? well yea it sounded like that. anyways as I was rocking him I put my hand on his stomach and id feel it as I was rocking him idk how to explain its not a ball but it like bump the side of his stomach wear my hand was everytime I rocked. I tryed burping again and that didnt seem to work. is this normal? hes not fussy, im just worried.