Pity I cant give a 0 star rating.
My 3 small children, wife and I were stuck in Amsterdam after booking flights from there to Krakow. The Expedia booking specifically stated the flights were Economy/Coach which has a baggage allowance, while Economy Lite does not have a baggage allowance. Once checked in we found that we were booked Economy Lite with no baggage. We attempted to contact Expedia to attach a baggage fee which would have been cheaper but got mucked about so much we had to buy over the counter baggage which was exorbitantly expensive by five bags. We were lucky the carrier's personnel were helpful (one child is disabled & required some help - thanks again Lufthansa staff)
To top this off the complaints process has taken five months of calls & emails & they've now stated my claim is bogus - despite sending in proof of the discrepancy.
If you're travelling with children do not use Expedia. Use it as a search engine then book through a carrier directly, it'll be cheaper & they have a complaints process.