This Datapack makes it so Baby Zombies will never spawn.
Changes all Baby Zombies, Husks, and Drowned into their adult version, except for ones that spawn in Trial Chambers, as those are supposed to add challenge to the structure, so I left them unchanged.
Baby Zombies will still spawn in Trial Chambers this is not a bug.
Be sure to install this Datapack to the right location or it will not work properly.
The correct file path is saves/[world]/datapacks
I now have a Ko-fi link located on the pack’s Modrinth page on the sidebar, but always remember donations are appreciated, but never required.
Please report any issues to the Discord located in the Links tab, or on the Planet Minecraft page.

With this Datapack Baby Zombies will no longer spawn (EXCEPT IN TRIAL CHAMBERS)