Baby villagers need their own bed. Villagers won't breed, if the number of beds is less than or equal to their number.
Villagers breeding when there isn't enough bed was a bug, and fixed in 14.3 https://bugs.mojang.com/browse/MC-145863
Niutp
Baby villagers need their own bed. Villagers won't breed, if the number of beds is less than or equal to their number.
Villagers breeding when there isn't enough bed was a bug, and fixed in 14.3 https://bugs.mojang.com/browse/MC-145863