Abstract: A device for reducing the possibility of sudden infant death syndrome (SIDS) comprises a position-indicating device effectively coupled to a signal-producing circuit and attached to the clothing of the infant. The position-indicating device provides signals varying in response to prone and other positions assumed by the infant during sleep, allowing an associated alarm device to be activated in response to the infant's assuming a SIDS-dangerous prone or side-lying position. In one embodiment, the position of the infant can be determined by an optical sensor interacting with a reflective or other marker adhered to the infant. Gravity or pressure switches may also be used to provide position-responsive signals. A signal generated upon assumption of the SIDS-dangerous prone or side-lying positions is transmitted to a remote receiver located proximate the infant's care-giver whereupon an alarm is generated to indicate the need to reposition the infant.