add class (not to first child)

HTML

<div class="test">
    <div class="different">title</div>
    <div class="same">a</div>
    <div class="same">b</div>
    <div class="same">c</div>    
</div>

CSS

.eg_1, .eg_2, .eg_3 {color:red;}

JavaScript

$(".test").children().each(function(i) {
  $(this).addClass("eg_" + (i+1));
});