Thank you for your query.
Antenatal diagnosis of renal issues in a fetus need to be followed up post-natally which you are doing so well. As the calyces are moderately dilated with disproportionate dilatation of renal pelvis
and parenchymal thinning the infant should be followed up by an pediatric nephrologist
. There should be some obstruction distally which is giving rise to such a finding and the pediatric nephrologist shall work up to find the cause and treat it accordingly.
I hope I have answered your query to your satisfaction.
Wishing your infant all the best.