The home health nurse is visiting a 3-month-old who has been diagnosed with congenital ...

The home health nurse is visiting a 3-month-old who has been diagnosed with congenital hypothyroidism and is taking daily thyroxine. The baby is on soy formula, and is at the 50th percentile for height and weight.
 
  Which of the following is the nurse planning to teach the mother? 1. Dairy-based formula is contraindicated when an infant is taking thyroxine.
   2. Soy-based formula can interfere with the absorption of thyroxine.
   3. As long as the baby is growing along the same growth curve, no interventions are necessary.
   4. Parents may stop the thyroxine as long as the baby remains in the 50th percentile for height and weight.