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I'm happy that you have asked me to assist you with your child and hope that you can benefit from my many years of helping parents like you.
You are correct that improper wiping (back to front) can lead to urinary tract infections, though likely not as commonly as we once thought.
Perhaps your ex has always attended to her own hygiene this way and thus doesn't know any better?
I always encourage mothers (and dads) to teach their potty training little girls to wipe front to back as it is much more hygienic and safer.
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