My 3 yr old has very dark circles under eyes,doctors keep saying it's nothing. what can i do? could she be deficient? she eats and sleeps well.

Dark circles: This very well could be normal. Children have thinner skin than adults so the blood vessels will show through giving a darker appearance . Often this darker skin can run though families or be a sign of allergies.

Nasal congestion: Check for nasal obstruction which is related to the dark circles which usually improve with relief of the nasal congestion often related to allergies in a child of this age. Talk to your doctor .