people have already mentioned the bug where if a nursing mother drank a certain vial and turned into a child again, she continue nursing until back at the point she was.

Well, I've observed something similar. Mamba was an adult villager with some farming and research skills, but not nursing when she drank the vial and turned into a 4 year old.

While she was growing up, I finished the game and set one of my male villagers to parenting to fill out the population. When Mamba turned 18, she was "embraced" and started nursing.

However her status never changed from 240 minutes (the game was on Normal mode!) until (I think) she was back to where she was before drinking the vial.