Switching Off

Here's a copy and paste from the Unofficial Disney Guide website, touringplans.com:

Take advantage of the "switching off" option, also called the Rider Swap, Baby Swap or Child Swap. To switch off, there must be at least two adults. Adults and children wait in line together. When you reach a cast member, say you want to switch off. The cast member will allow everyone, including young children, to enter the attraction. When you reach the loading area, one adult rides while the other stays with the kids. Then the riding adult disembarks and takes charge of the children while the other adult rides.

NOTE - A third adult (or child who meets the minimum height or age requirement) in the party can ride twice, once with each switching-off adult, so that the switching-off adults don't have to ride alone. There is no cost to use the "switching off" option.