Solution to select with many options

In these situations you can use the ternary operator ?: , directly in echo , like this:

<select class="alterarperfilNomeInput2" name="sexo">
<option value="Masculino"<?php echo ($row[sexo] == "Masculino" ? ' selected':'') ?>>Masculino</option>
<option value="Feminino"<?php echo ($row[sexo] == "Feminino" ? ' selected':'') ?>>Feminino</option>
</select>

For the day use for , like this:

<select name="dia" class="alterarperfilNomeInput2A">
<?php
for($i = 1;$i<=31;$i++) {
    echo '<option value="'.$i.'"'.($row[dia] == $i ? ' selected':'').'>'.$i.'</option>'."\n";
}
?>
</select>

You can always make an ajax call and get the value you have stored in the database (can you do this?). From there, you just place a function on the document ready of the page:

$( document ).ready(function() {
    var opcao = "5"; //exemplo de um valor do dia
    $('[name=dia]').val(opcao);
});

Link: jsfiddle

With this example it will work for any kind of select you may have. If it appears one that is not with the days of the month (value is an integer) and whether it is with automobile brands or so (the value is string) you will have problems ...

With this function you are free to use numbers or letters and you can also put the different value of the text in your options to select.

$dias = range(1,31);//array 1 a 31
$cont = 5;
select($dias,$cont);

$gender = array("masculino"=>"homem", "feminino"=>"mulher");
$gcont = "masculino";
select($gender,$gcont);

function select(array $options, $controler){
    $select_options = NULL;
    foreach ($options as $key=>$value) {
        $selec = ($key == $controler) ? "selected='selected'" : "";
        $select_options .= "<option value='$key' $selec>$value</option>";
    }  
    return $select_options;
}