What is the ruling concerning a wife afflicted with a disease that has arrested fetal growth, and she has exceeded the normal period of pregnancy; what is required of her if ritual purity becomes incumbent upon her; and what is the husband's duty towards her?

It is obligatory for a person in a state of major ritual impurity (junub) to perform a ritual bath (ghusl (definition)) with water. If water is not found, or if one is unable to use it due to illness or fear of harm, then one transitions to tayammum (definition) (dry ablution) to perform acts that require purity, such as prayer. This is based on the Almighty's saying: "And if you are in a state of major ritual impurity, then purify yourselves. But if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and find no water, then seek clean earth and wipe over your faces and your hands with it." If the excuse is removed, then the use of water becomes obligatory. Knowledge of harm is obtained through personal experience or the information provided by a trusted physician. It is recommended to observe appropriate times for ghusl, warm the water, dry the body, and avoid exposure to air to prevent harm.