Clinical features are often subtle with most newborn infants not diagnosed at birth (due to the presence of maternal thyroid hormones which crossed the placenta) (1).
Presenting features include:
An increased risk of congenital malformations are seen to be associated with congenital hypothyroidism e.g. - a study of 1420 infants with congenital hypothyroidism revealed that 8.4% had extra thyroidal congenital malformations of which majority were cardiac malformations (1).
Reference:
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