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Hey Lauren

Is there a functions.php file in your child theme? Try this in functions:

/**
 *  Comments template.
 */
if ( ! function_exists( 'vantage_comment' ) ) :
/**
 * Template for comments and pingbacks.
 *
 * Used as a callback by wp_list_comments() for displaying the comments.
 *
 * @since vantage 1.0
 */
function vantage_comment( $comment, $args, $depth ) {
	$GLOBALS['comment'] = $comment;
	switch ( $comment->comment_type ) :
		case 'pingback' :
		case 'trackback' :
			?>
			<li class="post pingback">
				<?php _e( 'Pingback:', 'vantage' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __( '(Edit)', 'vantage' ), ' ' ); ?>
			<?php
			break;
		default :
			?>
			<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
				<article id="comment-<?php comment_ID(); ?>" class="comment">
					<footer>
						<?php echo get_avatar( $comment, 50 ); ?>
						<div class="comment-author">
							<cite class="fn"><a href="<?php comment_author_url(); ?>" target="about_blank"><?php comment_author(); ?></a></cite>
						</div><!-- .comment-author -->
						<div class="comment-meta commentmetadata">
							<a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>"><time datetime="<?php comment_time( 'c' ); ?>"><?php
								/* translators: 1: date, 2: time */
								printf( __( '%1$s at %2$s', 'vantage' ), get_comment_date(), get_comment_time() );
								?></time></a>
							<span class="support">
								<?php comment_reply_link( array_merge( $args, array( 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?>
								<?php edit_comment_link( __( 'Edit', 'vantage' ), ' ' ); ?>
							</span>
						</div><!-- .comment-meta .commentmetadata -->
						<?php if ( $comment->comment_approved == '0' ) : ?>
							<em class="awaiting-moderation"><?php _e( 'Your comment is awaiting moderation.', 'vantage' ); ?></em>
						<?php endif; ?>
					</footer>
					<div class="comment-content entry-content"><?php comment_text(); ?></div>
				</article><!-- #comment-## -->
			<?php
			break;
	endswitch;
}
endif; // ends check for vantage_comment()