At around 4 weeks, our little man started to develop a rash around his neck, ears and face. We took him to the doctors to get checked out and the doctor thought it was a sweat rash. So from then on we stopped putting him in singlets and he only wore pure cotton outfits. We also changed from Johnsons baby wash to QV products. This stopped his outbreaks appearing. He is a very warm baby. Even though its winter, he is in t-shirts and singlets while most other babies are in layers and layers with blankets and all.