Hi
I first flew to Orlando when my son was 5 1/2 months old. I gave him his dummy on take off and on landing and he slept pretty much of the flight, we flew again when he was 16 months and that was alot harder work as he was more active, but again not to bad. This time we are flying next week yay! and he will be 3yrs 4 months and his sister will be 20 months. As long as you take plenty of things to keep them occupied and plenty of snacks and drinks i am sure you will be fine.