<div id="spisoc">
<div class="Content">1</div>
<div class="Content">2</div>
<div class="Content">3</div>
<div class="Content">4</div>
<div class="Content">5</div>
<div class="Content">6</div>
</div>
.Content:nth-child(n+5){
display: none;
}
$('#spisoc > .Content:gt(3)').hide();