Minecraft 1.13.1 Villagers won't breed

Question

This is my attempt at a village breeder. They each have stacks of carrots in their inventory, but no hearts show up and they won't breed.

This is what's below the part you see here, and the bottom is 7 blocks below where the villagers are. Can anyone see what I'm doing wrong?

Answer 1

The two things that would prevent a villager from breeding would be:

• Not enough doors: If there aren't enough valid doors, then the village is at its 'cap' and no villagers will breed
• Not enough happiness: If the villagers aren't happy, they won't breed. You can increase their happiness by trading with them.

Once you trade with the villagers a few times, and double check to make sure all the doors are legitimate, you should see them breed.