<s>[INST] my name is shashi, my son is onemonth old. he feels pabdominal pan and symtomps of gastric trouble is seen. in usg whole abdomen it is written mild splitting of left pelvicalyceal system is seen. now i want to know, what is the meaning of mild splitting of left pelvicalyceal system in 01 month old baby boy? is it harmful for baby's health? or it is normal, what is the requirement of treatment? [/INST] Hi.Thanks for your query.This is very typical problem as the son is only one month old.The meaning of the mild slitting of  left pelvicalyceal system is that there is a congenital disorder that the collecting system of the urine has split. This is possibly have a negative impact on the backpressure to the kidney is there is obstruction into one of the systems , as is observed as the age advances. If there is no Hydronephrosis at the moment. Just wait and watch. Have regular ultrasonography to follow the further progress. If surgery is required , i can be planned well any time but preferably after the child is 1 year old or 10 kg.This is surgically correctable, if the complications are anticipated, other wise  just wait and watch policy will be better. But you say he s in pain. Better to consult a Pediatrician and if necessary Pediatric Surgeon. </s>