Whether you're training for a marathon or looking to lose a few pounds, the best smart scales we've tested can effortlessly ...

and metabolic age or track pregnancy weight gain. And if you're not into all the bells and whistles of smart scales, no worries – you can always opt for a basic mechanical one instead.

If you begin at a healthy weight, your aim is to gain 1 to 4 pounds (0.5 to 1.8 kilograms) in the initial months of pregnancy. There's no need for extra calories, just a nutritious diet.