To the Editor.
—The Journal is to be commended for printing both an editorial1 and a lead article2 on the long-neglected subject of vitamin K deficiency occurring after the newborn period. It is increasingly clear that such deficiencies are far commoner than was heretofore realized.In all such cases published to date of which I am aware, the dietary intakes fell into one of the following: (1) milk substitute of low vitamin K content; (2) human milk; (3) no diet, or diet only of intravenous fluids; (4) soy protein formula of high vitamin K content; (5) insufficient information provided with regard to diet. The four cystic fibrosis cases of Walters et al2 and the three of Torstensen et al3 all fit into one of these patterns. Since the pattern of dietary intake of the reported infants with cystic fibrosis is identical to that of those