Villagers don't breed

I already know it's a duplicate. But this is pe. All conditions are fair enough to make them breed. They're inside a pre-made village, they're only small population, door are thrice the no. of them, made zombies chase them. I DID EVERYTHING FOR THEM TO BREED. Before; they just breed whenever they want. Sometimes many of them simultaneously! I don't know what happened. Just since 0.14, I never saw them breed again