<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Form Name</legend>
<div class="control-group">
<label class="control-label" for="textinput">Nome</label>
<div class="controls">
<input id="textinput" name="textinput" placeholder="" class="input-xlarge" required="" type="text">
</div>
</div>
<div class="control-group">
<label class="control-label" for="data_nascimento">Nascimento</label>
<div class="controls">
<input id="data_nascimento" name="data_nascimento" placeholder="" class="input-medium" required="" type="text">
</div>
</div>
<div class="control-group">
<label class="control-label" for="sexo_aluno">Sexo</label>
<div class="controls">
<select id="sexo_aluno" name="sexo_aluno" class="input-medium">
<option>Masculino</option>
<option>Feminino</option>
</select>