Sitting next to somebody is basically like sitting next to a ticking time bomb (not in the sense that your plane is going to get blown up, but in the respect that eventually (there will be an eventually) that baby will all of a sudden decide to be a little shit and cry his or her eyes out. You might be lucky to have noise-canceling headphones, but even those don't completely block everything. And headphones can't block the image of a baby spitting up on itself or the smell of one pooping. Pray you can sit in peace.