Oat baths - how often?

Hi, my 8 week old has developed a very itchy rash on her face, back, neck and chest. Oat baths seem to help soothe the inflammation/itching but just wondering how often should I be bathing her. Some say 2-3 times a week but some sources online say daily if theres a rash but make sure to use an emollient. Just looking for your own experiences to see what worked best?