No experience with a UTI but I'm on antibiotics for mastitis. I noticed a slight dip early on (although I had a fever so I think that had more to do with it) but my supply is back to normal now, I just kept nursing whenever she wanted.
I had one about 1 month pp with DS. It didn't effect my supply but I did make sure to take probiotics along with my antibiotics and I gave DS some too.
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Re: EBF and UTI