We are 2 adults and 1 child (4 years) travelling to Paris in January, staying for 4 days (Tue-Fri, 2 days Paris, 2 days at Disney). We'll need to get the train from CDG to central Paris, the train from Paris out to Disney and a train from Disney to CDG, plus also metro useage for 2 days in Paris. It looks like the Navigo pass would be the best option for us - is that right? What are RER prices for kids like? Should I just buy a Navigo for my daughter as well
Navigo Pass for all three of you is likely the best / easiest option and will cover you for all the transportation in and out of Paris from CDG and Disneyland. There is a TGV (high speed train) option between CDG and Disneyland but that would double your overall cost for a single ride from Disneyland to CDG. It is a nice option though if you don't mind the price and it is very efficient, about 12 minutes for the trip.