diff --git a/inst/sql/sql_server/field_plausible_after_birth.sql b/inst/sql/sql_server/field_plausible_after_birth.sql
index e42c3bdd..2bad7b05 100644
--- a/inst/sql/sql_server/field_plausible_after_birth.sql
+++ b/inst/sql/sql_server/field_plausible_after_birth.sql
@@ -45,11 +45,11 @@ FROM
                 CAST(CONCAT(
                     p.year_of_birth,
                     COALESCE(
-                        RIGHT('00' + CAST(p.month_of_birth AS VARCHAR), 2),
+                        RIGHT('0' + CAST(p.month_of_birth AS VARCHAR), 2),
                         '01'
                     ),
                     COALESCE(
-                        RIGHT('00' + CAST(p.day_of_birth AS VARCHAR), 2),
+                        RIGHT('0' + CAST(p.day_of_birth AS VARCHAR), 2),
                         '01'
                     )
                 ) AS DATE)
@@ -67,4 +67,4 @@ FROM
     }
     WHERE cdmTable.@cdmFieldName IS NOT NULL
 ) denominator
-;
\ No newline at end of file
+;