Doctors at the University of British Columbia in Vancouver, Canada, recruited 40 children who'd had at least two UTIs in the past year.
They randomly assigned the kids to drink one of two juices made for the study: a cranberry juice rich in proanthocyanidins (PACs) or a juice free of all "cranberry products."
Over the next year, kids who drank cranberry juice had UTIs at a rate of 0.4 per child, compared with 1.15 in the comparison group.
However, researchers warn the findings are not an endorsement of any product.
But the Journal of Urology, do give support to cranberry as a UTI fighter, according to a pediatric urologist not connected to the study. PACs are the compounds thought to give cranberries their bacteria-fighting potential.
Women have long turned to cranberry juice and supplements to help prevent recurrent urinary tract infections - though studies have been mixed on whether they work.
There has been little research on kids, even though UTIs are relatively common in children.
Girls have about an 8 per cent chance of contracting the infection at some point in childhood; boys have a 2 per cent chance.
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