Database: retail_complains
Question: Among the clients in Middle Atlantic, how many are them are female and no more than 18 years old?
SQL: SELECT COUNT(T1.sex) FROM client AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id WHERE T2.division = 'Middle Atlantic' AND T1.sex = 'Female' AND T1.age < 18