Find at least two adult villagers
Make sure they have access to beds
Place one extra bed for each baby villager you want to create
Make sure each bed has two empty blocks above it
Give the villagers enough food
Use bread, carrots, potatoes, or beetroot
Throw the food to the villagers or place it in their inventory through trading and farming
Ensure the villagers are willing to breed
Keep the villagers close enough to each other
Wait for hearts to appear
Wait for a baby villager to spawn
Repeat with more beds and more food to breed more villagers