Systems and methods for detecting, monitoring and profiling/correlating a subject's motions, such as rollovers, falls, shaking and tremors are disclosed. In particular, an infant's mobility event may cause critical event processing indicating that an infant has rolled over and may be suffocating. Such an event is classified as a Sudden Infant Death Syndrome (SIDS)-like event. The system may include a wireless pendant device and a wireless monitor server. The wireless pendant device is configured to measure acceleration motion of a subject, to generate acceleration data from the acceleration motion and to communicate the acceleration data with the wireless monitor server. The wireless monitor server is configured to analyze the acceleration data communicated by the wireless pendant device and to provide an output related to the analysis.