OK, since you are unfamiliar with it, first, a stock answer:
Just to avoid any confusion, there are TWO different things that some people refer to as "child swap", "baby swap", etc.
First, there is a formal system in place at most all Fastpass attractions that have a height requirement, called Rider Switch. Follow the link for complete details (and exceptions), but this is what most people will respond with for answers.
Second, at all other attractions, or at the Rider Switch attractions where a child simply chooses not to ride, there MAY be a way to accommodate the situation. However it is different at each attraction because of the different ways loading and unloading are handled which are often in different locations. Ask the greeting CM for what the possibilities are.
Now, as for using FP/FP+ in conjunction with Rider Switch - USUALLY this is no problem. Whoever is going to ride first will need a FP/FP+, and the one who stays behind will use the Rider Switch pass and can bring up to two others with them so they don't need to ride alone.
However, on rare occasions some CMs have asked for odd differences - I've seen them require the person staying to have a FP, which they will trade for the RS pass, or (even rarer) insist that the first group use the standby line only. But these are VERY rare.
Of course, with FP+ there isn't anything specifically to trade, and they'd have to be scanned for validity, so I think such odd occurrences will stop.
QUESTION FOR YOU ON THE RIDER SWITCH LINK....these rider switch passes that are noted in this is from 2007 - DO YOU KNOW FOR SURE THEY ARE STILL ALLOWING 3 people to come back on the pass??? Thank so much for your help!!!
