What was the delivery date of Congresswoman Kirsten Gillibrand's baby boy?
CREATE TABLE "pregnancies" (
  "congresswoman" text,
  "state" text,
  "date_of_delivery" text,
  "mother_s_age" real,
  "baby_gender" text
);
SELECT "date_of_delivery" FROM "pregnancies" WHERE "baby_gender"='boy' AND "congresswoman"='kirsten gillibrand';