CREATE TABLE table_18943444_1 (samples_taken INTEGER, product VARCHAR(255))
What is the smallest amount sampled of product 蒙牛牌嬰幼兒配方乳粉 ?
    
SQL: SELECT MIN(samples_taken) FROM table_18943444_1 WHERE product = "蒙牛牌嬰幼兒配方乳粉"