Table: vaccine_info
Columns: vaccine
minimum_age_at_1st_dose
number_of_doses
dose
minimum_interval_between_doses
route

Question: Name the least age for the 1st dose for 3 doses of 2-3 drops
SQL: SELECT "minimum_age_at_1st_dose" FROM vaccine_info WHERE "number_of_doses" = '3 doses' AND "dose" = '2-3 drops'

Question: How many doses for the bacillus calmette-guérin?
SQL: SELECT "number_of_doses" FROM vaccine_info WHERE "vaccine" = 'bacillus calmette-guérin'

Question: Name the least interval between doses for minimum age being 1st dose at 6 weeks old for the diphtheria-pertussis-tetanus vaccine?
SQL: SELECT "minimum_interval_between_doses" FROM vaccine_info WHERE "minimum_age_at_1st_dose" = '6 weeks old' AND "vaccine" = 'diphtheria-pertussis-tetanus vaccine'