Display checked checkbox if the value is saved in database

I'm currently working on displaying checked checkbox if its saved in database.

$stmt = $db->prepare('Select * from productsizes a, sizestops b WHERE 
a.productinformationID = :prodID AND a.sizeID = b.sizestopsID ');

    $stmt->bindParam(':prodID', $productID, PDO::PARAM_INT);
    $stmt->execute();

    $couunterer = $stmt->rowCount();
    $y= 1;
    while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {   

    if($y != $couunterer)
    {
    echo  $sizes5 = $row['sizetopsName']." ";  
    }
    elseif($y == $couunterer)
    {
    echo $sizes5 = $row['sizetopsName']." ";  
    }

    $y++;
    } 

This display my saved sizes for example XSMALL and LARGE

and this is my codes to display all checkbox from other table

$statement = $db->prepare("SELECT * FROM sizestops order by sizestopsID ASC");
$statement->execute();

while($rows2 = $statement->fetch(PDO::FETCH_ASSOC)) {

echo "
<label style=' display:inline-block;
    width:150px;
    height:50px;
    margin:-1px 4px 0 0;
    vertical-align:middle;'>

<input type='checkbox' name='sizes[]' class='checkbox' id='sizesprod' onchange='checksize()' value='" .$rows2['sizestopsID']. "'". $pre_checked.">".$rows2['sizetopsName']."
</label>";

}

This display all the sizes from

XSMALL, SMALL, MEDIUM, LARGE, XLARGE, XXLARGE, FREES SIZE

Now i want to display checked to checkbox XSMALL and LARGE only and the rest is not checked. How can i do that? Hopefully any one can help me with this thanks!

PHP and Javascript will do. Thanks