Minecraft Comes Alive 1.12.2 isn't stable it has a bit of issues that need to be patched. Biggest problem is similar to 1.10.2 babies can be placed unlimited times in shield hand (off hand) but in 1.12.2 either way shield hand (off hand) and main hand allows unlimited children. Also another issue is rendering villages cause players to crash and players crashing on child placement. It's very funky, the mod doesn't work 100% with tinkers construct go near a village crash and corrupted chunk created so stuck crashing endlessly. The suggestion I have is to update mod to latest 1.12.2 forge version, patch baby spawning and compatibility with other mods. Please and thank you I own it takes a lot of time to develop these things!