Help please!! We are flying to Mexico for Christmas and I have 3 children. Once we get there we are only driving from the airport for 5 minutes to our resort and then back to airport after vacation. My kids are 5, 3 1/2, and 6 months. We are bringing my baby's convertible for my 3 year old to use on the plane and then in the car for the baby to use. I bought a bubble bum for my oldest for the car ride. My 3 year old is 29 pounds and 39 inches. I know he is too young for a booster on a normal basis but for a total of 10 minutes in a taxi would the bubble bum be safer than him wearing nothing?? My family keeps telling me not to worry about it so much but I can't go against everything I believe in just for convenience and compromise my children's safety. Your help and advice is appreciated!