What is she eating? Is she breastfed? I had a problem with UTIs for a while ten years ago, and learned that E. coli can sometimes cause them, and it seems E. coli does better in more acidic urine, so maybe you should start by testing the baby's urine pH level? Then find out what alternatives you might have towards adjusting that if it turns out to be too acidic? I know what you could do for that with an adult because it is all about diet, but I don't know anything about feeding babies, unfortunately, as I don't have children of my own.
What is she eating? Is she breastfed? I had a problem with UTIs for a while ten years ago, and learned that E. coli can sometimes cause them, and it seems E. coli does better in more acidic urine, so maybe you should start by testing the baby's urine pH level? Then find out what alternatives you might have towards adjusting that if it turns out to be too acidic? I know what you could do for that with an adult because it is all about diet, but I don't know anything about feeding babies, unfortunately, as I don't have children of my own.
Well, that is the one alternative I can think of.
https://source.washu.edu/2015/06/a-persons-diet-acidity-of-urine-may-affect-susceptibility-to-utis/