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<!DOCTYPE html>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <div id="add">add</div>
  
  <div id="referenceDivId">
  </div>
</body>
</html>
 
$("#add").click(function() {
    if($("#referenceDivId").children().length == 0) {
        // if there are no children initially
        $("#referenceDivId").append("<div class='new'>New div</div>");
    } else if($("#referenceDivId").children().length == 5) {
        // do your magic when children divs are 5
    }
    else {
        // if it already had children
        $("#referenceDivId").find("div:last").append("<div class='new'>New div</div>");   
    }
});
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mohamedriaspro
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