diff --git a/src/Entity/Paragraph.php b/src/Entity/Paragraph.php
index d44bd63..bcbaaf0 100644
--- a/src/Entity/Paragraph.php
+++ b/src/Entity/Paragraph.php
@@ -87,6 +87,13 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface, EntityN
   protected $unserializedBehaviorSettings;
 
   /**
+   * Number of summaries.
+   *
+   * @var int
+   */
+  protected $summaryCount;
+
+  /**
    * {@inheritdoc}
    */
   public function getParentEntity() {
@@ -436,22 +443,26 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface, EntityN
    */
   public function getSummary() {
     $summary = [];
+    $this->summaryCount = 0;
     foreach ($this->getFieldDefinitions() as $field_name => $field_definition) {
       if ($field_definition->getType() == 'image' || $field_definition->getType() == 'file') {
         $file_summary = $this->getFileSummary($field_name);
         if ($file_summary != '') {
+          $this->summaryCount++;
           $summary[] = $file_summary;
         }
       }
 
       $text_summary = $this->getTextSummary($field_name, $field_definition);
       if ($text_summary != '') {
+        $this->summaryCount++;
         $summary[] = $text_summary;
       }
 
       if ($field_definition->getType() == 'entity_reference_revisions') {
         $nested_summary = $this->getNestedSummary($field_name);
         if ($nested_summary != '') {
+          $this->summaryCount++;
           $summary[] = $nested_summary;
         }
       }
@@ -459,6 +470,7 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface, EntityN
       if ($field_type = $field_definition->getType() == 'entity_reference') {
         if (!in_array($field_name, ['type', 'uid', 'revision_uid'])) {
           if ($this->get($field_name)->entity) {
+            $this->summaryCount++;
             $summary[] = $this->get($field_name)->entity->label();
           }
         }
@@ -478,6 +490,21 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface, EntityN
   }
 
   /**
+   * Gets the number of summaries.
+   *
+   * @return int
+   *   The number of summaries. Can be 0.
+   */
+  protected function getSummaryCount() {
+    if ($this->summaryCount !== NULL) {
+      return $this->summaryCount;
+    }
+
+    $this->getSummary();
+    return $this->summaryCount;
+  }
+
+  /**
    * Returns summary for file paragraph.
    *
    * @param string $field_name
@@ -526,15 +553,32 @@ class Paragraph extends ContentEntityBase implements ParagraphInterface, EntityN
    *   Short summary for nested paragraphs type.
    */
   protected function getNestedSummary($field_name) {
-    $summary = '';
-    if ($this->get($field_name)->entity) {
-      $paragraph_entity = $this->get($field_name)->entity;
-      if ($paragraph_entity instanceof ParagraphInterface) {
-        $summary = $paragraph_entity->getSummary();
+    $summary = [];
+    $summary_count = 0;
+    foreach ($this->{$field_name}->getValue() as $value) {
+      if (isset($value['entity'])) {
+        $paragraph_entity = $value['entity'];
+        if ($paragraph_entity instanceof ParagraphInterface) {
+          $summary[] = $paragraph_entity->getSummary();
+          $summary_count += $paragraph_entity->getSummaryCount();
+        }
+      }
+      // If we start with the closed summary the $value['entity'] is not
+      // calculated so we load the entity ourselves.
+      elseif (isset($value['target_id']) && isset($value['target_revision_id'])) {
+        $paragraph_entity = \Drupal::entityTypeManager()
+          ->getStorage('paragraph')
+          ->loadRevision($value['target_revision_id']);
+        $summary[] = $paragraph_entity->getSummary();
+        $summary_count += $paragraph_entity->getSummaryCount();
       }
     }
 
-    return trim($summary);
+    return \Drupal::translation()
+      ->formatPlural($summary_count, '1 Child | @summary', '@count Children | @summary', [
+        '@count' => $summary_count,
+        '@summary' => implode(', ', $summary),
+      ]);
   }
 
   /**
diff --git a/src/Tests/Experimental/ParagraphsExperimentalBehaviorsTest.php b/src/Tests/Experimental/ParagraphsExperimentalBehaviorsTest.php
index 639202a..f40f4fa 100644
--- a/src/Tests/Experimental/ParagraphsExperimentalBehaviorsTest.php
+++ b/src/Tests/Experimental/ParagraphsExperimentalBehaviorsTest.php
@@ -190,7 +190,7 @@ class ParagraphsExperimentalBehaviorsTest extends ParagraphsExperimentalTestBase
     // Assert that the summary includes the text of the behavior plugins.
     $this->clickLink('Edit');
     $this->assertRaw('class="paragraphs-collapsed-description">first_paragraph, Text color: blue, Bold: Yes');
-    $this->assertRaw('class="paragraphs-collapsed-description">nested_paragraph, Text color: blue, Bold: No, Bold: Yes');
+    $this->assertRaw('class="paragraphs-collapsed-description">1 Child | nested_paragraph, Text color: blue, Bold: No, Bold: Yes');
   }
 
   /**