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According to the Ultrasound
it says that there is block of the drainage
system of the kidneys. That is why there is kidney swelling with urine. If it is mild and there appears to be reasonably good kidney function, it is just monitored as quite often, things settle as baby grows. If monitoring shows however that there are significant problems such as severe obstruction or infections, then intervention is planned which could including providing a stent
to relieve the obstruction or some other procedure.
Babies with PUJ generally do very well if there are no additional underlying medical problems. What is essential is the monitoring so that if there are problems, they are picked up early and dealt with so baby can have a good quality of life.
Please speak to your Gynaecologist/Urologist
for details on prognosis and further management.