When I bring my whole family somewhere I almost always book the farthest back on the plane I can. There doesn't have to be specific sections... just people with common courtesy.

but one thing I'm noticing as a common theme in these threads is that there's an innate blame on the children/parents. Kids oftentimes CANNOT pop their ears due to how narrow their Eustachian tubes are. https://kidshealth.org/en/parents/flying-ears.html There can be cases where the baby's ears actually tear if the Eustachian tubes are blocked due to a cold or something of that nature.

The better answer is to just educate them in a friendly manner. If you do it tactfully then maybe junior will simmer down and everyone can move on without this passive aggressiveness we see in the photo. Giving the kid a bottle (if they're that young) is often all that needs to happen to work the tubes open a little bit to relieve the pain.

Now... if you're a parent... and have a colicky little one... skip the plane if you can. You know your kid. If they're not going to take to the plane well, then you're just being a dick to everyone around you.