Many moms like the convenience of the Sit n Stroll ($250) carseat/stroller combo. The two-in-one apparatus allows moms to transfer their tots straight from the plane through the terminal and into the car without unbuckling the tot. Aside from the hefty price, the other drawback is that some parents find it to be a tight squeeze in the actual plane seat. It is designed for newborns up to four–year–olds or those weighing between five and 40 pounds. The seat itself weighs 20 pounds.