I don't have children due to my highly #blessed lifestyle, but I DO have the utmost respect for anyone who parents responsibly. Kids aren't just small adults, they're people in a completely different stage of development - and consequently can be difficult to manage at times. Travel is famously one of those times.
If you've ever seen a child throw a tantrum at the airport or become too fussy to sleep on a plane, then you know what I'm talking about. Hell, plane travel makes even the most 'together' adults I know stressed. Once flights are booked and bags are packed, navigating the airport alone is an exercise in Not Breaking Into Panicked Tears (at least for me). I can't imagine doing all that with a child or three in tow.