The present invention relates to an infant body temperature and sleep monitoring system including a Bluetooth body temperature thermometer main body, an arm belt and a Bluetooth receiving member the Bluetooth body temperature thermometer main body is connected to a first side of the arm belt via a first adhesive strap a second side of the arm belt is disposed with a fastening ring at a first end and a second adhesive strap at a second end the second end of the arm belt which is disposed with the second adhesive strap passes through the fastening ring and engages with the second adhesive strap so that the arm belt forms a tightness-adjustable annular belt the Bluetooth body temperature thermometer main body obtains body temperature data and transmits the body temperature data to the Bluetooth receiving member. The present invention is simple in structure, convenient and practical and easy to wear.
