I think you can travel with children internationally when they are at least 6 weeks. I travelled to Jamaica with my daughter when she was 10 months, we had a 3 1/2 flight and she went to sleep about 20 minutes into the flight and was sleep the entire time, I gave her a bottle on take off and she had one of her favorite toys to play with. I took with me everything I would use at home and more, almost everything you have for a baby is available in portable form...highchairs, beds, etc. etc. Most restaurant had high chairs, if you traveling with a baby in the carrier you can just flip it over and place the carrier in between the legs. On flights you have the option of sitting baby on your lap or purchasing a seat for the carseat
and/or carrier.
Also, I took with me a jogging stroller, it was much easier to use on the beach and the bumpy roads.
