Dimplz, any time a female villager becomes young again, and later carries a baby, the baby will not be weaned until she once again reaches the age she was before her age reverted. In previous VV games, that was a rare occurrence, but in VV5 it's far more likely. We are still evaluating the effect of this situation on the game.
LOL LadyCFII, please forget I had a young nursing villager.
My original problem was I had a villager nursing for 14 years of her life (from age 19 to 33). This was a villager that was old, then I made her young, she grew up normally to age 19, THEN started nursing a baby and was still nursing the baby with 123 minutes left when she was 33. I made her young again AFTER all of that (and she turned into a nursing youth).
I am just trying to report a possible bug of when you make someone young and they grow up again, there may be problems with their babies.