The advantage of using conventional signs is that they are recognised by a very wide group of people. (homemade-baby-food-recipes.com)
Some people like to make up their own signs to use with their babies, whereas others use more conventional signs based on formal sign language. (homemade-baby-food-recipes.com)
However, it may have better accuracy than some of the more conventional signs and symptoms of twins. (twin-pregnancy-and-beyond.com)