Abstract: A pacifier thermometer of the present invention is made of plastic material, preferably silicone, having a cover to protect a nipple, a frame having a hole at the center portion that is concentric with both an annular projection at the convex side and a stop shoulder formed between the hole and the projection, a nipple having an inner hole at the top closed end and a circumferential flange at the bottom open end, an electronic compartment having a cap with an extending nodule at the center portion of one side that has a concentric hole formed in the nodule, a shell with a transparent window, and a circuit board that includes a chip, an LCD, and a speaker. When sensing temperature, the sensor sends the signal to the chip, which decodes the signal into a frequency signal, and then sends the frequency signal to a comparator for comparison with a prestored frequency range. The comparator then displays the reading on the LCD.