diff --git a/wagtail/wagtailcore/models.py b/wagtail/wagtailcore/models.py
index a0bae2c99..d8b27d271 100644
--- a/wagtail/wagtailcore/models.py
+++ b/wagtail/wagtailcore/models.py
@@ -575,7 +575,14 @@ class Page(MP_Node, ClusterableModel, Indexed):
         # Copy child objects
         if hasattr(self._meta, 'child_relations'):
             for child_relation in self._meta.child_relations:
-                pass
+                parental_key_name = child_relation.field.attname
+                child_objects = getattr(self, child_relation.get_accessor_name(), None)
+
+                if child_objects:
+                    for child_object in child_objects.all():
+                        child_object.pk = None
+                        setattr(child_object, parental_key_name, page_copy.id)
+                        child_object.save()
 
         # Copy child pages
         if recursive: