Use the builtin BestOutcome for the childbirth ritual instead of searching our own.

1.4/source/RJW_Menstruation/RJW_Menstruation/Hediff_MultiplePregnancy.cs

@@ -167,7 +167,7 @@ namespace RJW_Menstruation
             if (ModsConfig.BiotechActive)
             {
                 // Ugly, but it'll have to do
-                OutcomeChance bestOutcome = RitualOutcomeEffectDefOf.ChildBirth.outcomeChances.Find(chance => chance.positivityIndex == 1);
+                OutcomeChance bestOutcome = RitualOutcomeEffectDefOf.ChildBirth.BestOutcome;
 
                 string label = bestOutcome.label;
                 string description = bestOutcome.description.Formatted(mother.Named("MOTHER"));