A device (10) adapted to detect the presence of a child in a car seat (20) and to generate an emergency warning, is proposed. The device (10) comprises: a sensor arrangement (30, 70) that can be operatively coupled to the car seat (20), the sensor arrangement (30) being adapted to detect a body interacting therewith and to generate a signal indicative of the detection thereof; a communication arrangement (40) comprising a transmitter module (43) coupled to the sensor arrangement (30) and a receiver module (43) that can be coupled to a communication interface (61) of a vehicle (60) on which the car seat (20) is mounted, and an energy arrangement (50, 70) operatively connected to the sensor arrangement (30) and to the transmitter module (43) of the communication arrangement (40) and suitable for providing electric energy thereto.