A small number of babies who collapse and die unexpectedly in their first year are found to have one or more of the following three symptoms in common: bleeding just outside the brain (subdural hemorrhage); bleeding at the back of the eye (retinal hemorrhage); and brain swelling.
少数在不满一周岁意外夭折的婴儿被发现有以下三种症候中的一种或多种：大脑外延出血（膜下出血）、眼底出血（视网膜出血）和脑水肿。