<div class="profile-feed row">
   <div class="col-sm-6"> </div> // does this particular div has any child?
...
</div>

if($( ".col-sm-6" ).children()){
    alert('childern found')
}

var count = $(".col-sm-6").children().length;

var len = $(".col-sm-6").children().length;
if(len > 0)
   alert('Child exist');
else
   alert('Child does not exist');

var kids = $('.col-sm-6').children();
if(kids.length > 0) {
    alert('has children')
}