I may not be the first to discover this, I believe hundreds of others have found this. But if you left click a NPC villager of any type (blacksmith, farmer, etc.) with a bucket of milk, it will make it a baby villager of that type of villager. If I am dumb and this is in the update log, Please tell me in the comments below. :) By the way this is currently working in minecraft 1.4.5.

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