In this study, the development of golden hamsters’ urinary system after birth by assessing morphology, tissue structure, measurements, and cell reactions in both the kidneys and the ureters. A total of 60 golden hamsters were divided into four age groups (7, 14, 21, and 60 days), and examinations were made using light microscopy, morphometric analyses were carried out. The kidneys and ureters of hamsters grew and formed as the animal got older. One week after implantation, the kidney and ureter began forming; in the next 2 weeks, progress in the formation of the kidney and its filters was visible. At the end of 3 weeks, the embryo’s skeleton was fully formed, and by month 2, the organs started to look similar to those in an adult. The size of the bladder increased up to 5.55 mm by day 60, which means it could now store urine properly. There was a major increase in kidney weight, from 0.092 ± 0.005 g at day 7 to 0.471 ± 0.044 g at day 60, while the ureter weight went from 0.002 ± 0.0007 g to 0.090 ± 0.04 g during the same time frame. The kidney increased in length from 7.7 mm to 15.9 mm and the ureter increased from 11.77 mm to 27.61 mm (right side). Widening of the hilus demonstrated greater growth of blood and connective tissues.