Gud morning sir! my son did an ulstrasound of kidney nd pelvis the result is right kidney is normal in site nd echogenicity with minimal fullness of pelvicalyceal system, no stone. left kidney is normal in site, size and echogenicity with no hydronephrosis. filling volume is 27 ml. should i be worried? does he need any special diet? by the way he is two years and 9 mos. thank you!