Rash on the body of eight-month-old babies may be toddler rash, measles, eczema, milia and other causes. 1.toddler emergency rash: generally due to human herpesvirus type 6 infection, is a common rash in infancy and early childhood infectious diseases, manifested as a sudden high fever, body temperature up to 39 ℃ and above, can last for 3 ~ 5 days. After the fever subsides, a light red rash appears, often in the neck and trunk area first, then quickly spread to the back of the ear, buttocks, proximal limbs, within 1 day, 1~2 days after subsiding. 2. Measles: it is an acute respiratory infectious disease caused by measles virus infection, which belongs to category B infectious disease in our country, and is highly contagious, and it can be manifested as fever, cough, runny nose, maculopapular rash all over the body, oral measles mucous membranes spots, and hyperpigmentation left behind after the rash receded, and other symptoms. 3. eczema: is due to a variety of internal and external factors, can occur in any part of the body, can be manifested as dense groups of corn-sized pimples, blisters, oozing, itching and other symptoms, can be accompanied by the child’s irritability, poor quality of sleep. Rash on the body of eight-month-old babies may also be caused by other factors, it is recommended to take the child to the doctor in order to clarify the cause of the disease, targeted treatment.