Women who are pregnant or who might become pregnant have unique needs when it comes to tracking their weight. Many pregnant women probably don't want impedance measurements (think body fat, bone density, and water percentage) either because scales calculate those by sending mild electrical impulses through the feet. People who have a health device implant, such as a pacemaker, should likely avoid smart scales, as well. Some but not all scales that support impedance measurements have the option to turn them off. The QardioBase 2 has a full pregnancy-tracking mode. When it's active, impedance is shut off, and the scale flashes a happy face every time you step on it, rather than showing your weight in numbers. The companion Qardio mobile app also helps new moms slowly work back to their pre-pregnancy weight, if that's their goal.