A pediatrician refers an 18-month-old baby girl to a specialist because she thinks the baby is growing more slowly than normal. The specialist sees that the baby's thyroid gland is greatly enlarged. She orders some blood tests. The results show that the baby's plasma levels of T3 are low and plasma levels of TSH are high. Which one of the following is unlikely to be true?
A. The baby is usually lethargic.
B. The baby has a high body temperature.
C. The baby has not yet attempted to walk.
D. The baby's brain development is retarded.

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Low T3 and high TSH indicate hypothyroidism ... View the full answer