diff --git a/slave variables documentation - Pregmod.txt b/slave variables documentation - Pregmod.txt
index 832a076880c554d3cd99692971d003cbe257bcae..bb33da511897c4c9e1c9d4919b9d4d4c476595a4 100644
--- a/slave variables documentation - Pregmod.txt	
+++ b/slave variables documentation - Pregmod.txt	
@@ -2748,4 +2748,9 @@ WombUpdatePregVars($activeSlave) - automaticaly update $activeSlave.preg, $activ
 
 WombNormalizePreg($activeSlave) - automatialy correct all pregnancy related properties of given $activeSlave. Also it advance pregnancy if detected old .preg++ method used on slave and womb simulation is late. Can be called at any time without conditions checks - function do all needed checks by itself. Call of this function do NOT advance pregnancy by itself.
 
-P.S. All this womb system can be much more automated (.preg .pregType .pregSource .pregWeek may have to be done in a way, that they will have no need to be controlled manually anywhere at all. Just will be set fully automatially). But in this case many changes in present game code needed, to REMOVE legacy code.
+WombZeroID($activeSlave, _SlaveID) - automaticaly scan all fetuses and if their father ID matched - it will be replaced with zero. After it actor pregnancy related variables (like .pregSource) will be updated. Used mainly in process of removing slaves from game, to clean father's ID of unborn children of remaining slaves.
+
+All this womb system can be much more automated (.preg .pregType .pregSource .pregWeek may have to be done in a way, that they will have no need to be controlled manually anywhere at all. Just will be set fully automatially). But in this case many changes in present game code needed, to REMOVE legacy code.
+Right now they are set correctly, based on state of .womb object through pregnancy, but not outside. Also old style pregnancy initiation (setting only .preg to >0 and .pregType to >=1 ) working too - WombImpregnantion function for proper setup of .womb will be called on next SetBellySize call. Also old style pregnancy progression through using .preg++ is supported too, but can have minor issues with character descriptions in some cases, if SetBellySize widget not called before descriptions widgets.
+
+
diff --git a/src/js/wombJS.tw b/src/js/wombJS.tw
index 1ee5924269042743375e85b47934b60c87138463..7e357a751537aa4ed88f2ffe99c235731850bed3 100644
--- a/src/js/wombJS.tw
+++ b/src/js/wombJS.tw
@@ -290,3 +290,17 @@ window.WombNormalizePreg = function(actor)
 
     actor.bellyPreg = WombGetVolume(actor);
 }
+
+window.WombZeroID = function(actor, id)
+{
+    WombInit(actor);
+    var i, ft;
+    for (i in actor.womb)
+    {
+        ft = actor.womb[i];
+        if (ft.fatherID == id)
+            ft.fatherID = 0;
+    }
+
+    WombNormalizePreg(actor);
+}
diff --git a/src/npc/removeActiveSlave.tw b/src/npc/removeActiveSlave.tw
index 91ed24b3bebe8bfe3bfad949ea5b2996640f2e0d..e232fd9798a5f236bff1f320590e144e5a3e5cd7 100644
--- a/src/npc/removeActiveSlave.tw
+++ b/src/npc/removeActiveSlave.tw
@@ -41,9 +41,7 @@
 		<</for>>
 	<</if>>
 	<<for _y = 0; _y < _SL; _y++>>
-		<<if _ID == $slaves[_y].pregSource>>
-			<<set $slaves[_y].pregSource = 0>>
-		<</if>>
+		<<set WombZeroID($slaves[_y], _ID)>> /* This check is complex, should be done in JS now, all needed will be done here. */
 		<<if $activeSlave.daughters > 0>>
 			<<if $slaves[_y].mother == _ID>>
 				<<set $slaves[_y].mother = $missingParentID>>