diff --git a/frontend/lib/widgets/admin/common/admin_child_detail_modal.dart b/frontend/lib/widgets/admin/common/admin_child_detail_modal.dart
index df2c7bc..df063f2 100644
--- a/frontend/lib/widgets/admin/common/admin_child_detail_modal.dart
+++ b/frontend/lib/widgets/admin/common/admin_child_detail_modal.dart
@@ -57,6 +57,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
 
   bool get _isUnborn => _status == 'a_naitre';
   bool get _isScolarise => _status == 'scolarise';
+  bool get _isSansGarde => _status == 'sans_garde';
   bool get _showsAmPlacement => !_isScolarise;
 
   List<String> get _availableGenders =>
@@ -294,7 +295,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       return;
     }
 
-    if (_linkedAm != null) {
+    if (_linkedAm != null && !_isSansGarde) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(
@@ -332,11 +333,25 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
 
     setState(() => _placementBusy = true);
     try {
+      // Sans garde : éventuel lien résiduel à clôturer avant rattachement.
+      final previousAm = _linkedAm;
+      if (previousAm != null) {
+        await UserService.detachEnfantFromAm(
+          amUserId: previousAm.user.id,
+          enfantId: widget.enfant.id,
+        );
+      }
       await UserService.attachEnfantToAm(
         amUserId: selected.user.id,
         enfantId: widget.enfant.id,
       );
       if (!mounted) return;
+      setState(() {
+        // Le back passe déjà sans_garde → garde à l'attach ; on aligne l'UI.
+        if (_status == 'sans_garde') {
+          _status = 'garde';
+        }
+      });
       await _loadLinkedAm();
       widget.onSaved?.call();
       if (!mounted) return;
@@ -386,7 +401,13 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
         enfantId: widget.enfant.id,
       );
       if (!mounted) return;
-      await _loadLinkedAm();
+      setState(() {
+        // Le back repasse en sans_garde sauf a_naitre / scolarise.
+        if (_status != 'a_naitre' && _status != 'scolarise') {
+          _status = 'sans_garde';
+        }
+        _linkedAm = null;
+      });
       widget.onSaved?.call();
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
@@ -402,6 +423,30 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
     }
   }
 
+  /// Passe en « Sans garde » : cadre vide + détachement AM si besoin.
+  Future<void> _applySansGardeStatus() async {
+    final am = _linkedAm;
+    if (am == null) return;
+
+    setState(() => _placementBusy = true);
+    try {
+      await UserService.detachEnfantFromAm(
+        amUserId: am.user.id,
+        enfantId: widget.enfant.id,
+      );
+      if (!mounted) return;
+      setState(() => _linkedAm = null);
+      widget.onSaved?.call();
+    } catch (e) {
+      if (!mounted) return;
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
+      );
+    } finally {
+      if (mounted) setState(() => _placementBusy = false);
+    }
+  }
+
   InputDecoration _inputDecoration({String? hint}) {
     return ValidationFieldDecoration.input(hint: hint).copyWith(
       isDense: false,
@@ -479,11 +524,16 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
                   ),
                 )
                 .toList(),
-            onChanged: (v) => setState(() {
-              _status = v;
-              _coerceGenderForStatus();
-              _dirty = true;
-            }),
+            onChanged: (v) {
+              setState(() {
+                _status = v;
+                _coerceGenderForStatus();
+                _dirty = true;
+              });
+              if (v == 'sans_garde') {
+                _applySansGardeStatus();
+              }
+            },
           ),
         ),
         ValidationLabeledField(
@@ -731,6 +781,8 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       );
     }
 
+    // Sans garde : toujours le cadre vide (comme après détachement AM).
+    if (_isSansGarde) return _emptyAmSlot();
     if (_linkedAm != null) return _linkedAmCard();
     return _emptyAmSlot();
   }