Inclusion Criteria:  Newborn feeding on Breast Milk or Artificial Milk Formula from birth to about 2 months of age. Infant feeding on Breast Milk or Artificial Milk Formula from 2 months to 1 year Children feeding on Breast Milk or Artificial Milk Formula from 1 year to 5 year. Children feeding on Breast Milk or Artificial Milk Formula from 5 year up to 15 year Adult patients from 15 years to 25 years who did not feed on any Artificial Milk Formula or any source of DHA . Infants and children patients who feed on only cow's milk which does not provide a rich source of DHA and did not feed on any Artificial Milk Formula or any source of DHA  Exclusion Criteria:  Age above 25 years. Adult patients from 15 years to 25 years who feed on any Artificial Milk Formula or any source of DHA ..