Abstract: Methods and systems for avoiding undesired body temperatures in children, the elderly/infirm, and/or animals by transmitting one or more warning messages to one or more predetermined recipients so that corrective action can be taken. Using a child as an example, a wearable monitoring device is used to sense the presence of the child and to sense the body temperature of the child. When the monitoring device detects that it is being worn and that the sensed body temperature satisfies a threshold, the monitoring device transmits a warning message.