Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_28 ( minimum_age_at_1st_dose VARCHAR, number_of_doses VARCHAR, dose VARCHAR )

### Question ###
Name the least age for the 1st dose for 3 doses of 2-3 drops

### Accurate SQL ###

SELECT minimum_age_at_1st_dose FROM table_name_28 WHERE number_of_doses = "3 doses" AND dose = "2-3 drops"