All babies who have history of kidney swelling at any time during the pregnancy should get an ultrasound done at round 4 days of life. We need to get at least two ultrasound 4 week apart before labeling the baby as normal. This decision (Labeling the baby as normal) must be taken by the pediatric nephrologist not by the pediatrician or an obstetrician.
http://www.doctorsinciti.com/pediatric-nephrologist-child-kidney-doctor-noida.html