What causes an unborn baby to have fluid in his kidneys?

Fluid in an unborn baby's kidneys, known as hydronephrosis, can be caused by various factors, including a blockage in the urinary tract, abnormal kidney development, or issues with the ureters that prevent normal urine flow. In some cases, it may be associated with underlying genetic conditions or congenital anomalies. Maternal health factors, such as Diabetes, can also contribute to this condition. Regular prenatal monitoring can help detect and manage such issues early.