diff --git a/src/Simulation.cpp b/src/Simulation.cpp
index ea8ccfd..3f9a20b 100644
--- a/src/Simulation.cpp
+++ b/src/Simulation.cpp
@@ -72,19 +72,13 @@ SimulationData::BasicMetrics<int> Simulation::progressByOneYear(
         {
             ++yearMetrics.deaths_;
             it = individuals_.erase(it);
-            continue;
         }
-
-        if (shouldHaveOffspring(individual))
+        else
         {
-            for (int i{0}; i < params_.offspring_.count_; ++i)
-                individuals_.emplace_front(individual.offspring(
-                    *generator_, params_.mutations_.added_));
-            yearMetrics.births_ += params_.offspring_.count_;
+            handleOffspring(individual, yearMetrics);
+            individual.ageByOneYear();
+            ++it;
         }
-
-        individual.ageByOneYear();
-        ++it;
     }
 
     return yearMetrics;
@@ -231,3 +225,16 @@ int Simulation::getLivesOnYearStart(
 
     return basicMetrics[static_cast<std::size_t>(year - 1)].getLivingAtEnd();
 }
+
+void Simulation::handleOffspring(const Individual& individual,
+                                 BasicMetrics& yearMetrics)
+{
+    if (!shouldHaveOffspring(individual))
+        return;
+
+    for (int i = 0; i < params_.offspring_.count_; ++i)
+        individuals_.emplace_front(
+            individual.offspring(*generator_, params_.mutations_.added_));
+
+    yearMetrics.births_ += params_.offspring_.count_;
+}
diff --git a/src/Simulation.h b/src/Simulation.h
index 168bf38..f6aa039 100644
--- a/src/Simulation.h
+++ b/src/Simulation.h
@@ -59,6 +59,9 @@ class Simulation
     int getLivesOnYearStart(
         int year, const std::vector<BasicMetrics>& basicMetrics) const;
 
+    void handleOffspring(const Individual& individual,
+                         BasicMetrics& yearMetrics);
+
     std::list<Individual> individuals_;
 
     config::Params params_;