The study was observational, analytical and cross-sectional. The patients under this study were selected from the Obstetric ward of BSMMU and BIRDEM Hospital, from June 2005 to October 2005. A total of sixty-six samples were collected from women during 28 weeks to 36 completed weeks of gestation. Among them, twenty-two samples were from mothers having GDM, twenty-two having PIH and twenty-two belonged to normal pregnancy (control group). The placentas were examined to measure their diameter, thickness, cotyledons number, weight, and volume.