diff --git a/src/js/wombJS.tw b/src/js/wombJS.tw
index 054018dd62c22e8759a442b6247fa19c0026a969..ecfa8ae157349ff4a20c4503f2dd935a007cf202 100644
--- a/src/js/wombJS.tw
+++ b/src/js/wombJS.tw
@@ -345,7 +345,7 @@ window.fetalSplit = function(actor)
 	nft.identical = 0;
 
 	actor.womb.forEach(function(s){
-		if (jsRandom(1,1000) > 900 && s.identical !== 1)
+		if ((jsRandom(1,1000) >= 1000) && s.identical !== 1)
 			nft = {};
 			nft.age = s.age;
 			nft.fatherID = s.fatherID;