I just asked my wife who travelled extensively alone with my children when they were babies and when one was toddler and the other a baby etc etc. It was certainly challenging for her, but she never once had to change a nappy in the seat... Must have taken 50 flights long haul and short haul chasing me around the world on a variety of aircraft, so it does make me wonder what is required to be considerate?
Mind she also mentioned that she preferred flying Western Airlines over the Middle Eastern ones as the crew tended to be more proactive helping her, unlike being dumped at a set of steps by a limo for a First class flight with Qatar and the crew watching her struggle to get a baby, toddler, folded pushchair, nappy bag, hand bag, teddy bears, baby blankets etc up the stairs in several runs (they did their job perfectly, but never exceeded the requirement to be kind).