Lidefelt K, Herthelius M. Antenatal hydronephrosis: infants with minor postnatal dilatation do not need prophylaxis. Pediatr Nephrol. 2008;23:2021-4 pubmed publisher
..All four developed UTI. We conclude that UTI is uncommon in infants with two normal postnatal US examinations. Routine use of antibacterial prophylaxis in these infants therefore cannot be recommended. ..