Sign diaper by taking your hands and placing them down around your waist. Take your index fingers and middle finger together from each hand and tap them on your thumbs. It is like you are playing mini castanets at waist-height. Lots of people will do the sign a bit higher up on the body if necessary for your baby to see it properly.
Diaper is one of those incredibly useful signs that really improves life for both Baby and Mommy. Diaper is one of the first signs we teach a baby, and we use it to indicate when we are about to change the baby's diaper. Eventually the baby learns that by signing diaper, she can get a dirty diaper changed. Being able to communicate this need helps avoid a lot of frustration and crying. As your child gets more advanced, you can also use diaper as part of a question. "Do we need to change your diaper?"
The sign for diaper can help your baby communicate to you when she needs a diaper change. It is a great sign to teach, not only because it can let you quickly resolve the issue without your baby getting upset, but it also sets you up well for getting ready for potty training.