Edited by Althea May Atherton. I have spent the last two weeks acutely aware of sensors and sensor error. Newborns can communicate in finite ways, useful signals all, but a scream is an alert, not a diagnostic. For those who require immediate attention in a Neonatal Intensive Care Unit, or NICU, being born means a rapid transit from nude in the womb to swaddles and an array of sensors, providing doctors and nurses readings on heart rate, respiratory rate, and blood oxygen levels, among others.