I know you can generally take a baby/toddler to the plane in a stroller and have it stowed in the cabin for de-boarding. We are not taking a stroller with us on our trip (our two year old will NOT stay in it, so then we end up pushing around an empty stroller while carrying her), but we will be taking a backpack style carrier with us (which she can spend hours in.) Will they be likely treat this the same as a stroller and keep it in the cabin or will they make us check for the cargo-hold? I'm just concerned that we will end up without it until the baggage pick-up or of it being broken in the hold.
I know the ultimate say will be with our carrier (Lufthansa), but I also know that customer service answers are sometimes dependent on the agent at the time.