<div class="col-md-6 col-sm-6 col-xs-12 xdisplay_inputx form-group has-feedback">
<input type="text" class="form-control has-feedback-left" name="jFecha" id="single_cal4" placeholder="Fecha Nacimiento" aria-describedby="inputSuccess2Status4">
<span class="fa fa-calendar-o form-control-feedback left" aria-hidden="true"></span>
<span id="inputSuccess2Status4" class="sr-only">(success)</span>
  </div>