Guernsey Fetus - 6.5 Months.
This 6-month old fetus was 210 days overdue. It ceased growing at about 6 months of gestation due to a nonfunctional pituitary gland. It remained alive in a vegetative state for nearly 10 months. Due to a nonfunctional fetal hypothalamo-pituitary-adrenal action it was also unable to initiate parturition.
Drost M (1968)