mysqlで今日の7日前に誕生日を選択する方法

select * from user_table
where date_format(date_sub(birth, interval 7 days), "%m-%d")
    = date_format(now(), "%m-%d")
   or date_format(date_sub(birth, interval 7 days), "%m-%d") = '02-29'
  and month(now()) = 2 and month(date_add(now(), interval 1 day)) = 3