diff --git a/lib/growth/growth.ex b/lib/growth/growth.ex
index 641e049..73b627c 100644
--- a/lib/growth/growth.ex
+++ b/lib/growth/growth.ex
@@ -94,7 +94,8 @@ defmodule Growth do
       %__MODULE__{
         name: name,
         gender: gender,
-        date_of_birth: date_of_birth
+        date_of_birth: date_of_birth,
+        results: []
       },
       fn {key, default_value}, measurement ->
         opts