Summary In order to elucidate the mechanism by which phototherapy induces loose stools in newborns, studies were performed on the speed of gut transit by performing the Carmine Red test on normal newborn, on jaundiced newborns before and after phototherapy. A statistically accelerated intestinal transit was observed in jaundiced newborns treated with phototherapy. The increased rate of intestinal transit produced by phototherapy is probably due to the action of the photo‐decomposition derivatives of bilirubin, which are excreted during phototherapy.
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Rubaltelli et al. (1973) studied this question.