The spleen is the human body's largest lymphoid organ. The appearance of the spleen is inflated by a variety of conditions, such as cell abnormalities that lodge within the spleen or storage function disorders. As a result, the spleen's size can be used as a predictor of illness severity. Place and period of study: From July 2019 to May 2020, all of these samples were taken from autopsied bodies in the mortuary room of Kirkuk forensic medicine and the institute of forensic medicine in Baghdad, with legal authority. Study design: Cross-sectional descriptive study. Materials: The current study used 20 autopsy neonate human spleens ranging in age from 1 to 28 days that were collected from available dead undergoing post-mortem examination, were studied macroscopic and microscopic after staining with Hematoxylin and Eosin. Results: The number of notches in this study ranged from zero to five, however the top score of the specimens had one or two notches. The accessory spleen, on the other hand, was not found in the area the spleen's hilum. From the first day forward, the characteristic lymphoid follicle or white pulp could be recognized. During this time, nucleated red blood cells were observed. Purpose of study: Because no data on the standard dimensions of the normal spleen exists in the Iraqi population, the findings of this study may reveal differences in spleen morphology and provide valuable data for parameter standardization, It will be useful for correct clinical diagnosis and treatment of disease by physicians, surgeons, radiologists, and anatomists.