Editar Clientes

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Editar Clientes</title>
</head>
<body>
<?php
include "Clientes.php";
$cliente = new Clientes();
$idCliente = $_GET["idCliente"];
$dados = $cliente->listarUnico($idCliente);
?>
<form action="alterarCliente.php" method="POST">
<?php
while ($row = $dados->fetch_assoc()) {
        //printf ("%s (%s)\n", $row["idCliente"], $row["nome"]);
        $idCliente = $row["idCliente"];
        $nome = $row["nome"];
        $dataNasc = $row["dataNascimento"];
?>

    <div><input type="text" name="idCliente" readonly="" value="<?php echo $idCliente ?>"></div>
    <div><input type="text" name="nome"  value="<?php echo $nome ?>"></div>
    <div><input type="text" name="dataNascimento" value="<?php echo $dataNasc ?>"></div>
    <input type="submit" name="" value="Alterar">

<?php
    }


?>
</form>
</body>
</html>