The history of Green stool
Diarrhea with a report of 10-15 pus cells / hpf is indicative of an active infection.
Please consult a Pediatrician
for a proper antibiotic and probiotic course.
Also get the stool culture and sensitivity test done , this will help if the routine antibiotic does not help as by that time you get the report.
See why is the baby is getting infection- problem with bottle sterilization
/ Waterborne diseases
as the bottles are not properly cleaned by sterile water- may be done with the routine tap-water.