Welcome to health care magic.
 1.The 
ultrasound report indicates there is a obstruction note in the right pelvis but calyx appears normal. This is seen in case of extra 
renal pelvis - which is normal variations - for which treatment is not needed.
2.Left 
kidney appears normal, no abnormality regarding pelvis and calyx.
3.Voiding cystouretro-gram is done to see the status or 
urethra, bladder, and latency of ureters ( if there is any reflex)  
4.There might be symptoms of burning micturition or involuntary passage of urine - in this symptoms if there are no findings in ultrasound further evaluation is done possibly for that. 
5.If there are findings suggest 
cystitis - then baby needs antibiotic, no other way to treat with out. Hope the best and take course of antibiotic. Good luck.
Hope i have answered your query.
Any thing to ask do not hesitate. Thank you.