A normal term umbilical cord
measures around 60 cm. and anything below 32cm after 20 weeks of gestation is short. The weight of the placenta is consistent with the gestational age
. The shortness of the umbilical cord could be firstly, either the whole length was not supplied to pathology or it is suggestive of a fetal abnormality like decreased psychomotor development. The greyish tan indicates hemosiderin
deposits probably due to infarction
that could be due to PIH or UCA. The baby also should be examined to conclude. UCA has only a 2-4% incidence in still births. I think the pathologist should be able to give you a correct idea. Wish you good health.