A thermometer is the first device every home needs, especially with young children. A digital underarm thermometer is reliable, affordable and works for the whole family. Infrared forehead or ear thermometers read in seconds, which helps when a baby is asleep, but you need the right distance and position from the manual. Avoid mercury thermometers: they break easily and mercury is toxic. Look for a backlit screen, a beep when done, a colour fever alert and an easy-to-replace battery. Wipe the probe with alcohol after each use.