Pelvicalyceal dilatation of 3-4 mm. is considered minimal and not further investigated during the neonatal period. If the dilatation is more than 4 mm., a follow up ultrasound
is performed after the first week of life to determine vesico-ureteric reflux or obstruction. Once the condition is diagnosed, it is managed by medical or surgical means depending on the case and either way, the results are good with majority having no recurrences. So, there is nothing done actively now as the rest of the findings appear to be normal. Consult your obstetrician along with a nephrologist
for future management. Good luck.