I can't seem to make my villagers breed. I gave all 6 of them a stack of bread. I've made a few houses. There must be 9 houses in total. I've traded with 3 of them. Am I doing something wrong or is it because it is the first world I made on my PS3? I used to have another village with a lot of villagers but somehow zombies got them all. The only villagers left are those 6 in a separate village.