Hello. Antenatal hydronwohrosis ( pelvis dilatation) is a serious condition in infants. You need to evaluate with following test.
Depending on resolution or not of the dilatation / recurrent uti/ fever he may need further evaluation to rule of reflux/upjo to prevent long term
kidney damage (test like MCU and DTPA)
Next Steps
Usg kub at 4 weeks of age
RFT with serum
Electrolytes
Urine r/m and culture
Health Tips
Did you have oligohydraminos during any trimester?