diff --git a/banban-mini/src/pages/bind/index.tsx b/banban-mini/src/pages/bind/index.tsx
index 473377b..ed944d8 100644
--- a/banban-mini/src/pages/bind/index.tsx
+++ b/banban-mini/src/pages/bind/index.tsx
@@ -20,7 +20,6 @@ import {
   CHILD_NAME_RULE_MESSAGE,
   createChild,
   getChildren,
-  sanitizeChildNameInput,
   resolveChildSelection,
   setSelectedChildId as setStoredSelectedChildId,
   validateChildNameInput,
@@ -804,9 +803,10 @@ export default function Bind() {
                   ? children.length > 0 ? '不选已有宝贝时，可填写2-5位简体中文姓名（暂不支持数字和英文）' : CHILD_NAME_RULE_MESSAGE
                   : children.length > 0 ? '不选已有宝贝时，可填写2-5位简体中文姓名（暂不支持数字和英文）' : '可不填，稍后再关联宝贝'
               }
-              maxlength={5}
+              maxlength={-1}
               onInput={(event) => {
-                const nextChildName = sanitizeChildNameInput(event.detail.value)
+                // Preserve pinyin composition; validate the final name on submit.
+                const nextChildName = event.detail.value
                 setNewChildName(nextChildName)
                 if (nextChildName) {
                   setSelectedChildId(null)
diff --git a/banban-mini/src/pages/sleep/index.tsx b/banban-mini/src/pages/sleep/index.tsx
index f15f80e..e5c1988 100644
--- a/banban-mini/src/pages/sleep/index.tsx
+++ b/banban-mini/src/pages/sleep/index.tsx
@@ -26,7 +26,6 @@ import {
   CHILD_NAME_RULE_MESSAGE,
   clearSelectedChildId,
   deleteChild,
-  sanitizeChildNameInput,
   setSelectedChildId,
   updateChild,
   validateChildNameInput,
@@ -1496,8 +1495,8 @@ export default function Sleep() {
                 value={childName}
                 placeholder={CHILD_NAME_RULE_MESSAGE}
                 focus
-                maxlength={5}
-                onInput={(event) => setChildName(sanitizeChildNameInput(event.detail.value))}
+                maxlength={-1}
+                onInput={(event) => setChildName(event.detail.value)}
               />
             </View>
             <View className='modal-actions'>
diff --git a/banban-mini/src/services/child.ts b/banban-mini/src/services/child.ts
index 205835b..29cc07f 100644
--- a/banban-mini/src/services/child.ts
+++ b/banban-mini/src/services/child.ts
@@ -17,10 +17,6 @@ export function normalizeChildNameInput(value?: string | null): string {
   return String(value || '').trim()
 }
 
-export function sanitizeChildNameInput(value?: string | null): string {
-  return normalizeChildNameInput(value).replace(/[^\u4e00-\u9fa5]/g, '').slice(0, 5)
-}
-
 export function validateChildNameInput(value?: string | null): string {
   const childName = normalizeChildNameInput(value)
   if (!childName) return '请输入宝贝姓名'