Hi, I m,Dr.Hina working as an assistant of Doctor Muhammad Mohsin a best pediatric surgeon in Lahore.UPJ obstruction in babies is mainly due to improper development of the ureter and renal pelvis. Furthermore, it may be due to kinking of the ureter or a blood vessel that causes the intermittent obstruction. Intermittent obstruction means that sometimes the kidney functions correctly, but sometimes it retains the urine. Alsa Pakistan is at your disposal for the best paediatric ureteropelvic junction treatment in Pakistan.