One year old baby fever rash, usually consider the following situations: 1, the rash is related to the pathogens that cause fever, common viral infections or bacterial infections, which can release toxins that lead to increased skin sensitivity, causing a rash, such as measles, toddler rash, chicken pox, etc.; 2, one year old baby fever rash, may also be related to the child’s medication, because some children may have Drug allergies, taking drugs may cause a rash; 3, there are some babies with fever and rash, with fever during the intestinal sensitivity increased, easy to appear food allergies. If a child ingests food that is prone to allergies, such as common allergic foods are milk, eggs, seafood, nuts.