Sonographic Follow up in Newborns Diagnosed With Prenatal Hydronephrosis

In this retrospective study the investigators will enroll newborns that were born between 01.01.2010 and 31.12.2012 in Hillel Yaffe Medical Center with the prenatal diagnosis of Pyelectasis according to prenatal sonographic screening test.

These babies underwent renal sonography at the age of 2-5 days according to the protocol and were invited to an additional renal sonographic screening test at the age of 1 month.

The investigators will compare the results of the 2 examinations and the investigators will try to reach conclusions whether there is correspondence between the severity of the pyelectasis in the first and second sonographic tests and the outcome of these newborn babies