Identifying infants at risk for SIDS includes applying electrodes to an
infant, receiving electrical signals from the electrodes, analyzing the
received electrical signals to measure alternans of a heart of the
infant, and identifying whether the infant is at risk for SIDS. A system
for identifying infants at risk for SIDS includes an input unit
configured to receive electrical signals from electrodes applied to an
infant, a processor connected to the input unit and configured to process
the received electrical signals to measure alternans of a heart of the
infant, and a comparator configured to compare the measured alternans
with alternans in a population of infants.