Checks if there is a previous page
<?php
$subpages = $page->children()->paginate(10);
$pagination = $subpages->pagination();
?>
<!-- foreach loop with subpages -->
<?php if($pagination->hasPrevPage()): ?>
<a href="<?php echo $pagination->prevPageUrl() ?>">
prev (<?php echo $pagination->prevPage() ?>)
</a>
<?php endif ?>
<?php if($pagination->hasNextPage()): ?>
<a href="<?php echo $pagination->nextPageUrl() ?>">
next (<?php echo $pagination->nextPage() ?>)
</a>
<?php endif ?>