My family and I will be traveling to WDW for the first time in February. We are flying Southwest. We plan to use a carseat on the plane for my son who will be 20 months old. He's 25 pounds and 27 inches tall currently. I am confused about what car seat to buy for him. He is still currently in his infant rear facing carseat in the car so we need to buy a new seat regardless of flying. Southwest says that the car seat width must be no wider than 16 inches. I have yet to find a car seat that even exists with dimensions this narrow. What have you all used on SWA specifically? Thanks! 
