Baby scales include a housing, a weighing tray, a measuring device and a display. The weighing tray is disposed on the housing and configured to hold a baby. The measuring device is configured to support the weighing tray and to determine a weight of the baby. The measuring device includes at least one of an electric length measuring device configured to measure a length of the baby and an attachment mechanism configured to attach the electric length measuring device. The display is configured to show the determined weight of the baby.