How many doors does it take to get minecraft villagers to have babies?

Answer 1

Once housing has been established, villagers will then mate until the number of adult villagers equals 0.35 times the number of doors. Any remaining children will grow up as usual, resulting in a total number of adult villagers somewhere above one third of the number of nearby wooden doors.

If someone can provide better information, please do so. This is just a copy-paste from the minecraft wiki, which can be found by clicking on the link.

Answer 2

The number of villagers in the village must be under 35% of the number of doors in the village, for them to even attempt to breed. So a village with 100 valid doors, can support a village population of 35 - if the population is below this, it is possible for them to breed.

But it is not as simple as that, as villagers must also be willing. They can be made willing by completing trades with them, and they will become willing if they have a certain amount of food in their hidden inventory - 3 bread, 12 carrots and 12 potatoes. Villagers will harvest the village crops, craft bread and share food to help facilitate breeding.