This is so emotionally manipulative and so blatant, too! You're not even trying to hide your entitlement and trying to wrangle it with "kindness and decency." OK-so where are you and other entitled parents like you showing kindness and decency to anyone else? Or is it, as it so typically is, something you just expect to be granted year on year because "you have kids, don't you know?"
It's galling how blatant your entitlement is. Having children isn't a special circumstance. People have children all the time and they have to work bank holidays like everyone else. Guess why? Because they signed a contract at a workplace stating that bank holidays are a requirement.
Having children, funnily enough, doesn't and shouldn't free someone of their contractual obligations that they willingly signed up to.
A special circumstance would be someone having a parent who is terminally ill and for whom this Christmas may be their last. That would be a time when it would be reasonable to expect that colleagues band around and support that colleague to have that day off to spend with a loved one.
Having a baby isn't a special circumstance. The baby doesn't know it's Christmas and there's nothing stopping you making the exact same memories on another day. I do understand why people would want to be off-but if it's your turn to work-suck it up, buttercup.
I get that working and having kids is a massive juggle. I don't have kids and don't want them-but I do understand that. But it's not your colleagues without children's job to pick up your slack because @SleepFinally wants to make magic with her kids every Christmas, is it?
And you can say it's just one Christmas-but once this type of shit is allowed to slide once, it becomes normalised. Next year, Jill's baby will be a toddler and much more aware of Christmas so then Jill will pluck a new reason why she must have Christmas off and OP gets landed with it again.
And it's even worse if it's a heavily female-dominated field-like nursing, etc, because there's nearly always going to be someone in the team or joining the team who will have little ones. So, even when some of the other kids have grown up enough for their parents to decide they will work Christmas-other colleagues may have little ones and the cycle continues.
But of course-it's acceptable to you for people who don't have kids to routinely miss out on Christmas because well "kindness and decency, right?" With no mention of how the parents are going to show kindness and decency in return.
This is why the fairest way to sort this is via a rota-system. One year on, one year off. No quibbles and only the special circumstances (like the one detailed above) qualifies as an exception. People shouldn't get to use their parental status as a get out of work free card.
And colleagues without children are not parents dumping ground.