Is it permissible to pray in clothes that have been stained by the urine of a nursing infant, in order to alleviate hardship for a sick person who is harmed by frequent changes of clothes?

A Muslim must keep their body, clothes, and place of prayer as pure as possible. However, if a nursing mother is inconvenienced by changing her clothes, she is permitted to pray in her nursing clothes after taking precautions by placing a cloth or garment between herself and the baby. Any subsequent contamination is excused due to the difficulty of maintaining complete purity, as is the view of the Maliki school of thought.