Whenever i spawn a baby variant of a player mob, it always crashes. However, upon re-entry into the world, the baby variant seems to be fine. So something must be happening that causes it to say "nope, not gon keep goin"

This is now fixed in 2.1.3 available on curse at: https://www.curseforge.com/minecraft/mc-mods/player-mobs/files/3736288

What's the actual error? It should be in the log somewhere or as a crash report

crash-2022-03-29_14.10.01-client.txt
here's the whole crash report for context

Looks like an incompatibility with Neat, will look into this.
From a first look this should happen to all spawns with an egg and not just babies?