Babysitter is an advanced sign, best taught to older children as it consists of two signs, care and person, signed consecutively. First, sign care by making both hands into the ASL sign for 'K' (with the tip of your thumb between the index and middle fingers, and the pinkie and ring fingers curled). Stack the 'K' hands on top of one another and circle them in front of your body.
Then sign person by taking both your hands with fingers outstretched and parallel, with your bent arms shoulder-width apart in front of your body, starting with your open hands at shoulder height and ending down at your waist level.
Babysitter can be used if your child has some regular babysitters that take care of him. The sign can be used to prepare your baby for the arrival of the sitter if you are going out. “Kim, your babysitter is coming to play with you tonight.”
Teach the sign contextually when you drop your baby at the sitter's or nanny's place. if your child has several sitters, consider adding the first initial of their sitter's name to make a compound sign.