What's the best treatment for my two month old and her eczema?

Non perfumed lotion: At 2months old it could still be a newborn rash like seborrhea (cradle cap) or ecezma also known as atopic dermatitis. Both are essentially dry irritated skin. First line of treatment is hydration of the skin. Use thick heavy lotions such as aveeno, (oatmeal) lubidrem, eucrin or generic equivalent. If infant is still irritated, red and itchy talk to your doctor about using steriod creams to calm the skin.