Do swimming lessons present a health risk to children that are prone to bladder and urine infections?

No, but staying in a: wet swimsuit, like wearing silk panties, keeps the perineum moist & can cause vulvitis; then, wiping back-to -front can cause an ascending bladder infection. Cotton panties wick away moisture. Showers are better than baths with floating soap or bubbles because ^ed alkalinity reduces vulvar mucosa's resistance to bacteria; Sitz baths with 1 cup of vinegar/6" of water ^ its resistance.