The case of a 6-year-old mentally retarded boy is described, who was delivered by breech presentation and who was later found to have adrenal calcifications. He presented with severe hypoglycemia during infancy and early childhood. Subsequent examinations revealed the coexistence of pituitary growth hormone and ACTH-deficiency and of adrenal medullary insufficiency. The hypothalamus-pituitary-thyroid and -gonadal axes were apparently normal. It is concluded that both, the pituitary and adrenal medullary insufficiency are probably due to the same complications at birth (hypothalamic or pituitary asphyxia and adrenal hemorrhage) and that both conditions contributed to the development of hypoglycemia.