diff --git a/src/wp-admin/includes/class-wp-site-health.php b/src/wp-admin/includes/class-wp-site-health.php
index b7847d5e310a8..8ea3c1f098a35 100644
--- a/src/wp-admin/includes/class-wp-site-health.php
+++ b/src/wp-admin/includes/class-wp-site-health.php
@@ -509,6 +509,7 @@ public function get_test_theme_version() {
 		$theme_updates = get_theme_updates();
 
 		$themes_total        = 0;
+		$child_themes_total  = 0;
 		$themes_need_updates = 0;
 		$themes_inactive     = 0;
 
@@ -543,6 +544,12 @@ public function get_test_theme_version() {
 		}
 
 		foreach ( $all_themes as $theme_slug => $theme ) {
+
+			if ( $theme->get( 'Template' ) && $theme->get( 'Template' ) !== $theme_slug ) {
+				++$child_themes_total;
+				continue;
+			}
+
 			++$themes_total;
 
 			if ( array_key_exists( $theme_slug, $theme_updates ) ) {
@@ -609,6 +616,21 @@ public function get_test_theme_version() {
 					__( 'Your site does not have any installed themes.' )
 				);
 			}
+
+			if ( $child_themes_total > 0 ) {
+				$result['description'] .= sprintf(
+					'<p>%s</p>',
+					sprintf(
+						/* translators: %d: The number of child themes. */
+						_n(
+							'Additionally, your site has %d installed child theme.',
+							'Additionally, your site has %d installed child themes.',
+							$child_themes_total
+						),
+						$child_themes_total
+					)
+				);
+			}
 		}
 
 		if ( $has_unused_themes && $show_unused_themes && ! is_multisite() ) {