Humm... I had this villager in 30's nursing a baby, and halfway through, she had one of those strange berries that turned her into a 12-year-old, then she grew up to age 14, but still having a status of nursing, and carrying the baby from 2 years ago... is this a bug?

Kelly -

That issue has been reported by other players! It is indeed a bug and annoying, but luckily it doesn't really harm your game like a crash would. Now other players have said that after quite some time she does finally let the baby go! Because of the age shift it takes a while though.

I hope this wasn't one of your best researchers or something! That'd be a bummer