processes here such as measles and other viral exanthems. Atopic dermatitis and a sweat rash for your older child may have to be considered. Atopic dermatitis may be considered for rash which occurs in infancy as well as for toddlers.
Yes, take them to a pediatrician so that they may be assessed early. Give them enough fluid from water, juice or soups. Wash the area with a mild cleanser and keep them away from too much heat or sun exposure.