I asked Abu Jafar Imam Muhammad ibn Ali Al-Baqir (as): "What is your ruling regarding a man who struck a young woman on her abdomen, causing damage to her womb and disrupting her menstruation? She reported that her menstruation had ceased due to this injury, whereas it had previously been regular." Imam (as) said: "She should be observed for one year. If her womb recovers and her menstruation returns to normal, then there is no liability. But if it does not return, she is to take an oath, and the assailant must pay one-third of her diyyah (blood money) for the damage to her womb and the cessation of her menstruation."