diff --git a/1.4/Assemblies/RJW_Menstruation.dll b/1.4/Assemblies/RJW_Menstruation.dll
index 0621e5c..325db98 100644
Binary files a/1.4/Assemblies/RJW_Menstruation.dll and b/1.4/Assemblies/RJW_Menstruation.dll differ
diff --git a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Breast.cs b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Breast.cs
index b0d8b79..1d5eb60 100644
--- a/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Breast.cs
+++ b/1.4/source/RJW_Menstruation/RJW_Menstruation/HediffComps/HediffComp_Breast.cs
@@ -246,8 +246,14 @@ namespace RJW_Menstruation
 
         protected void CalculateBreastSize()
         {
-            // Scenario A: the youngest child is less than halfway into babyhood: Full size
-            if (ageOfLastBirth + BabyHalfAge * GenDate.TicksPerYear > Pawn.ageTracker.AgeBiologicalTicks)
+            // Ageless pawns can't depend on the chrono age, so just disable their growth entirely
+            if (Pawn.ageTracker.BiologicalTicksPerTick <= 0f && breastSizeIncreased > 0)
+            {
+                ShrinkBreasts();
+                debugGrowthStatus = "Base size (ageless)";
+            }
+            // The youngest child is less than halfway into babyhood: Full size
+            else if (ageOfLastBirth + BabyHalfAge * GenDate.TicksPerYear > Pawn.ageTracker.AgeBiologicalTicks)
             {
                 debugGrowthStatus = "Full size due to young child";
                 if (breastSizeIncreased < MaxBreastIncrement)
@@ -256,7 +262,7 @@ namespace RJW_Menstruation
                     breastSizeIncreased = MaxBreastIncrement;
                 }
             }
-            // Scenario B: Pregnant, grow in the second half of first trimester
+            // Pregnant, grow in the second half of first trimester
             else if (Pawn.IsRJWPregnant() || Pawn.IsBiotechPregnant())
             {
                 float pregnancySize = Mathf.InverseLerp(breastGrowthStart, breastGrowthEnd, Pawn.GetFarthestPregnancyProgress()) * MaxBreastIncrement;
@@ -279,7 +285,7 @@ namespace RJW_Menstruation
                 }
                 else debugGrowthStatus = "Pregnant and full size";
             }
-            // Scenario C: Not (or very early) pregnant and youngest child nonexistent or more than halfway into babyhood, time to shrink
+            // Not (or very early) pregnant and youngest child nonexistent or more than halfway into babyhood, time to shrink
             else if (breastSizeIncreased > 0)
             {
                 debugGrowthStatus = "Shrinking due to no pregnancy nor young child";
@@ -291,7 +297,9 @@ namespace RJW_Menstruation
         protected void CalculateNipples()
         {
             float newNippleProgress;
-            if (ageOfLastBirth + BabyHalfAge * GenDate.TicksPerYear > Pawn.ageTracker.AgeBiologicalTicks)
+            if (Pawn.ageTracker.BiologicalTicksPerTick <= 0f)
+                newNippleProgress = 0f;
+            else if (ageOfLastBirth + BabyHalfAge * GenDate.TicksPerYear > Pawn.ageTracker.AgeBiologicalTicks)
                 newNippleProgress = 1f;
             else if (Pawn.IsRJWPregnant() || Pawn.IsBiotechPregnant())
                 newNippleProgress = nippleTransitions.Evaluate(Pawn.GetFarthestPregnancyProgress());
diff --git a/changelogs.txt b/changelogs.txt
index 237beb1..a798296 100644
--- a/changelogs.txt
+++ b/changelogs.txt
@@ -5,6 +5,7 @@ Version 1.0.8.5
  - Some males will release small amounts of semen into a womb during vaginal sex before their actual ejaculation.
  - Babies born from multiple pregnancy will properly produce the prompt to name them.
  - Hopefully improve compatibility with xenotype inhertiance-altering mods for multiple pregnancy.
+ - Pawns that have stopped aging will no longer have larger breasts during and after pregnancy.
  - Experimental "periodic ovulator" cycle type, currently not used. See Patches/Hediffs_Private_Parts_Animal.xml.
 
 Version 1.0.8.4