Agreed. Flying with my own kids, I'm constantly helping them. They struggle with headphones, opening food, fastening seat belts, being reminded to use the bathroom. Worse: they spill food, have potty training accidents, kick seats, yell, cry, and get scared. It gets easier as they get older, thankfully.

With an infant, having two caregivers within reach is huge. When flying with infant in arms there's nowhere to put the kid down, you don't have a free hand. An extra set of hands to wipe up spit-up, help adjust clothing for breastfeeding, collect the diaper bag, etc is a huge help.

The idea that parents need to pay more to help their children is cruel. I would expect people seated next to a child to end up swapping, to help the parent and to escape the noisy child. But that slows down boarding as people shuffle seats and adds anxiety that we're perfectly able to resolve.