If you weigh on home scales this way, they can be up to 1lb out. My son only just regained his birthweight by day 16 and is gaining about an ounce a day. I bought a proper baby weighing scale and while still not as accurate as medical grade scales it does give a better idea than getting on the scales without baby and then with, also it weighs to within 10g (some weigh to within 5 grams) whereas most home scales weigh to within 100g or in the case of pounds and ounces, to within about 3 ounces xx