Lord Help Me, I Do Not Understand Straight Women

Since about two months after I got into the Zelgan ship (so for about half a year now), its fandom on Tumblr has been obsessed with babies. How many babies, what to name the babies, what the babies are going to look like when they grow up.

I don't get it. I don't get it. I don't get it.

I mean, I sort of get it. The babies of major characters are an opportunity to create OCs in a universe that wouldn't otherwise accommodate OCs while showing the canon characters as older and more mature versions of themselves - as adults instead of screaming teenagers, basically.

I'm working on a "shitty dad Ganon" story right now in which Ganondorf has to babysit Tetra while they wait for Link. Ganondorf is canonically a grumpy fucker, and Tetra is canonically a little smartass, and it's cool to play with that sort of dynamic as they gradually learn to tolerate each other. It's also fun to yank them out of their canonical roles as villain and victim and to put them into a situation that neither of them has any idea how to handle.

The variations on the "Ganondorf makes half a dozen babies" story I've been seeing popping up have been somewhat more difficult for me to process, however. And yet somehow everyone seems to have jumped onboard the concept of babies. There's even been some gorgeous fan art dedicated to people's personal headcanons.

Is there some sort of biological drive at work here that I'm genetically unequipped to understand?