For those of you who have traveled with a child under 2, do you keep them on your lap for the flight (free), or buy them a seat? We are currently set to leave Friday with our 7 month old riding as a lap child but now things I’m reading on the internet are freaking me out about not restraining my baby during the flight. However, putting my baby in a seat would obviously cost more and require I haul a car seat to Disney world. Curious for thoughts and experiences.