Exactly what our local naturopath said. She told me it's common for kids to get UTI's after a course of AB's if no acidophilus is given. So I bought him some inner health plus immune boost for kids.

She explained that both the digestive and urinary tract are made of the same membranes and thus why pro biotics help stop overgrowth of bacteria (vs cranberry which just stops it adhering to the walls)

As for the showering, he still showers with his daddy so hygiene is pretty good.

It is strange that he has never had a UTI til last year and the second wasn't actually a UTI (we discovered the infected penis) I have to wonder if a combination of AB's, and no follow up has resulted in that infection never quite clearing and that's what we are seeing now.