The 3 in 1 baby bath tub from aqua scale has been updated complete with a patented innovative technology this new and improved design includes a refreshed design and interface helping parents monitor their childs development as well as providing peace of mind at bath time this unique shape of the tub and anti slip insert safely holds babies for up to 2 years old or until they can sit up unassisted set the scales to either lbs or oz and simply place baby into the tub for a precise weight