Chorionic vessels present on placental surface show two types of branching pattern, the dispersal type where the blood vessels undergo successive divisions with gradually diminishing caliber towards periphery and the magistral type where vessels give small branches without marked reduction of caliber. The present study was conducted to correlate the branching pattern of chorionic blood vessels to birth weight of new born in full term pregnancy. Material and Methods:- This study was conducted on 200 full term placentae obtained from Department of Obs. & Gyane., Rajarshi Dashrath Autonomous State Medical College, Ayodhya. To observe the different branching pattern of chorionic blood vessels, dye injected method was used. The birth weight of new-born baby was also noted by digital baby weighing scale. Results and Discussion – In chorionic blood vessels the dispersal type (54%) of branching pattern was predominant over magistral (46%) and mean birth weight in dispersal type was 2.55±0.33 kg & in magistral type it was 3.15±0.45kg respectively. Conclusion:- It was concluded that branching pattern of chorionic vessels directly affect birth weight of new born.