diff --git a/packages/material-ui-lab/src/AvatarGroup/AvatarGroup.d.ts b/packages/material-ui-lab/src/AvatarGroup/AvatarGroup.d.ts
index 17c3ea3469700b..b2f90e471bb5c1 100644
--- a/packages/material-ui-lab/src/AvatarGroup/AvatarGroup.d.ts
+++ b/packages/material-ui-lab/src/AvatarGroup/AvatarGroup.d.ts
@@ -6,7 +6,7 @@ export interface AvatarGroupProps
   /**
    * The avatars to stack.
    */
-  children: React.ReactNode;
+  children?: React.ReactNode;
   /**
    * Max avatars to show before +x.
    */
diff --git a/packages/material-ui/src/Badge/Badge.d.ts b/packages/material-ui/src/Badge/Badge.d.ts
index 91103a3ea2336c..c4ffa0f26105e3 100644
--- a/packages/material-ui/src/Badge/Badge.d.ts
+++ b/packages/material-ui/src/Badge/Badge.d.ts
@@ -23,7 +23,7 @@ export interface BadgeTypeMap<P = {}, D extends React.ElementType = 'div'> {
     /**
      * The badge will be added relative to this node.
      */
-    children: React.ReactNode;
+    children?: React.ReactNode;
     /**
      * The color of the component.
      * It supports those theme colors that make sense for this component.
diff --git a/packages/material-ui/src/StepContent/StepContent.d.ts b/packages/material-ui/src/StepContent/StepContent.d.ts
index 3dbad048c2935b..596eeb5bf262c5 100644
--- a/packages/material-ui/src/StepContent/StepContent.d.ts
+++ b/packages/material-ui/src/StepContent/StepContent.d.ts
@@ -8,7 +8,7 @@ export interface StepContentProps
   /**
    * Step content.
    */
-  children: React.ReactNode;
+  children?: React.ReactNode;
   /**
    * The component used for the transition.
    * [Follow this guide](/components/transitions/#transitioncomponent-prop) to learn more about the requirements for this component.
diff --git a/packages/material-ui/src/StepLabel/StepLabel.d.ts b/packages/material-ui/src/StepLabel/StepLabel.d.ts
index 8970a2c3cde2a0..53d9eddd2f5804 100644
--- a/packages/material-ui/src/StepLabel/StepLabel.d.ts
+++ b/packages/material-ui/src/StepLabel/StepLabel.d.ts
@@ -7,7 +7,7 @@ export interface StepLabelProps
   /**
    * In most cases will simply be a string containing a title for the label.
    */
-  children: React.ReactNode;
+  children?: React.ReactNode;
   /**
    * Mark the step as disabled, will also disable the button if
    * `StepLabelButton` is a child of `StepLabel`. Is passed to child components.