Background: The fetus, placenta and mother constitute a triad of contributors to pregnancy outcome. When pregnancy is complicated by a medical problem like, diabetes mellitus which affects maternal health, architecture and functions of the placenta may even jeopardize the fetal normalcy. The placenta being the bridge between maternal and fetal activities, considered as a window through which maternal dysfunctions and their impacts on fetal well being can be understood. Aim: The aim was to study gross morphology of placentae of women with gestational diabetes mellitus and to compare the results with normal pregnancies. Methods: It was an observational study. After due approval from institutional ethics committee, 40 placentae from pregnant women clinically diagnosed with gestational diabetes mellitus and 40 placentae from uncomplicated normal pregnant women were collected from labour room and operation theatre of department of obstetrics and gynaecology of government medical college hospital in Jaipur (Rajasthan). Confirmed gestational diabetic cases were selected purposively while controls were taken sequentially. Gross morphological features of each placenta were recorded. The statistical methods used were unpaired 't' test and chi square test. Results: The results showed that weight, diameter, surface area, central thickness and number of cotyledons of placentae from diabetic mothers were significantly more than placentae from normal uncomplicated pregnancies, while no significant differences were observed in shape and site of umbilical cord insertion. Conclusion: The gross morphology of placentae with gestational diabetes mellitus significantly differs from normal pregnancies which may be associated with alteration in physiological functioning of placenta and ultimately fetal outcome.

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