What is NOT a common symptom of congenital hypothyroidism in infants?

Congenital hypothyroidism is a condition in which an infant is born with an underactive thyroid gland, leading to insufficient production of thyroid hormones. The symptoms of this condition often reflect the reduced metabolic activity associated with hypothyroidism.

A puffy face is a common symptom found in infants with congenital hypothyroidism. This characteristic appearance is due to myxedema, which results from the accumulation of mucopolysaccharides in the skin and other tissues. Moreover, weakness and hypotonia, which refer to decreased muscle tone and strength, are also typical symptoms of congenital hypothyroidism as infants may display low energy levels and poor muscle function.

In contrast, hyperactivity is not a symptom associated with congenital hypothyroidism. Infants generally have reduced activity levels and lethargy due to the deficiency of thyroid hormones that are critical for growth, development, and metabolism. Thus, identifying hyperactivity as an uncommon symptom highlights the contrast in energy levels and activity patterns in infants suffering from this condition.