Thanks for writing to health care magic.
I think you should get your baby properly investigated for that problem.
There could be some obstruction because of renal stone or some other cause if the baby is getting proper hydration.
Please do not try to take those home remedies
. Proper investigations like ultrasound
abdomen, X ray
etc will help in diagnosis. Improper measures will cause renal damage.
Continue to ask further queries as required.
Hope this helps.