We saw the family ahead of us in line get one for an under 3 child. They gave the child a thin card that looked just like the regular tickets, and that was what the
DAS was attached to for the child. (I remember this vividly because my son then demanded that he get a special card, too, which the kind CM just gave him as a dummy card.) Of course, I think just with any DAS, the child must ride on the ride in order to use the DAS.