Most airlines charge 10% of the adult fare for a child under two years old to fly without a seat of their own. If you want your baby to have their own seat, it may cost 50-70% of the adult fare, but you should always check with the individual airline. If you have booked your child a seat, you will also have to pre-book a travel cot or sky cot for them. These are usually only available on long-haul flights.
Rope rescue is a subset of technical rescue that involves the use of static or low-stretch, nylon or polyester ropes, anchoring and belaying devices, friction brake devices and rope grabs, pulleys and other equipment for lowering systems and mechanical advantage haul systems.
Really though, the only time you'll see someone actually using the rope to get up is in aid climbing or caving and the only time you'll see someone climbing on a rope that's already fixed at the top is in top-rope climbing or roped solo climbing. Not if they can help it, rope ain't cheap!