Do not stop breast feeding your child even if there are diarrheal episodes. The sugarcane juice is not known to have effects on a mother's milk in the long run. Since you are giving her formula feeds, it is more important to ensure proper handwashing and follow strict hygiene while handling her utensils. Assess the quantity of your milk by expressing it in a calibrated glass and if the quantity is anywhere between 30-35 ml, it should be fine. If it is less, you need to continue Lactogen feeds. Get her stool routine test done to rule out any infection. For this you need to show her once to your Pediatrician
who will also be able to assess if there is any dehydration
in your baby and stop any unnecessary medication.