diff --git a/pino.d.ts b/pino.d.ts
index 895bc4e39..b681ee8fe 100644
--- a/pino.d.ts
+++ b/pino.d.ts
@@ -80,7 +80,7 @@ interface LoggerExtras<Options = LoggerOptions> extends EventEmitter {
      * @param options: an options object that will override child logger inherited options.
      * @returns a child logger instance.
      */
-    child<ChildOptions extends pino.ChildLoggerOptions>(bindings: pino.Bindings, options?: ChildOptions): pino.Logger<Options & ChildOptions>;
+    child<ChildOptions extends pino.ChildLoggerOptions = {}>(bindings: pino.Bindings, options?: ChildOptions): pino.Logger<Options & ChildOptions>;
 
     /**
      * This can be used to modify the callback function on creation of a new child.
diff --git a/test/types/pino.test-d.ts b/test/types/pino.test-d.ts
index dbfd0852d..6ae04f542 100644
--- a/test/types/pino.test-d.ts
+++ b/test/types/pino.test-d.ts
@@ -329,3 +329,15 @@ pino({
     crlf: true,
 });
 
+const customLevels = { foo: 99 };
+
+const customLevelLogger = pino({ customLevels });
+
+type CustomLevelLogger = typeof customLevelLogger
+type CustomLevelLoggerLevels = pino.Level | keyof typeof customLevels
+
+const fn = (logger: Pick<CustomLevelLogger, CustomLevelLoggerLevels>) => {}
+
+const customLevelChildLogger = customLevelLogger.child({ name: "child" })
+
+fn(customLevelChildLogger); // missing foo typing