Hydronephrosis is a common condition that may be diagnosed while your child is still in the womb or after birth. It may resolve itself soon after delivery, but sometimes it may cause problems as your child grows. If there is a blockage present in your child’s urinary system, the kidneys can swell from a backup of urine, known as reflux. If you have been told your child has hydronephrosis, our pediatric urologists and nephrologists can diagnose and manage the cause of your child’s condition. We work with your prenatal team to plan for your child’s assessment and treatment, if needed, after delivery.