Write SQL query to solve given problem: Among the clients in Middle Atlantic, how many are them are female and no more than 18 years old?. Keep the solution inside sql tag ```sql [SQL-Query] ```
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