There were 13 neonates with congenital hypothyroidism; at least two of them were not referred, and thus not treated during the ... The most frequent endocrine abnormalities observed in children with DS involve the thyroid gland, and the risk of thyroid ... the most common viable chromosome abnormality, is associated with an increased risk of medical complications. ... There were 13 neonates with congenital hypothyroidism; at least two of them were not referred, and thus not treated during the ...