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T HE following description of a cineradiographic study of breast feeding supplements our previous paper on bottle feeding (Ardran, Kemp and Lind, 1958). The investigations were made concurrently and with the same apparatus.Forty-one infants were examined while feeding at the breast. They were of both sexes and of ages ranging from a few days to several months. METHOD Before the examination the mother's nipple and its surrounding areola were thinly coated with a paste of barium sulphate powder in Lanoline. The baby was laid on a couch so as to obtain films of the head and neck in lateral projection. The mother leaned over the couch with her body twisted so as to allow one breast to project clear of the chest wall. A nurse adjusted the baby to the mother's nipple and when feeding was established the radiographic exposure was made. One cinefilm was taken of each subject (25 frames per second), the exposure limited to approximately four seconds, the dose-rate being about 0-3 r at the skin per 100 frames. Care was taken to make the mother comfortable by adjusting the height of the couch and by providing suitable supports for her arms. In seven individuals the inner and outer margins of the areola were also marked with pieces of tin foil embedded in plastic skin.Four women also had 16 mm colour cinefilms taken to show the infant taking the nipple into the mouth and feeding. Films were also taken of the mother's breast as feeding was interrupted by removal of the child. RESULTS

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