Baby's Stool Colour

My baby's poop these days are greenish + Yellowish. Previously her poop is always yellowish She is 3M old and have been on formula since newborn. She took her 3 months immunization jab and oral rotavirus dose 1 few days back, she also had fever so i gave paracetamol prescribed by doctor for 2 days. Now she has no more fever only that her poop these few days changed colour. Is this because of the jab or medication? Or purely because of formula?