A mother brings her 2-month-old daughter in for an examination and says, "My daughter rolled over against the wall, and now I have noticed that she has this spot that is soft on the top of her head. Is something terribly wrong?" How should the nurse respond?

"Perhaps that could be a result of your dietary intake during pregnancy."

"That 'soft spot' may be an indication of cretinism or congenital hypothyroidism."

"That 'soft spot is normal, and actually allows for growth of the brain during the first year of your baby's life."

"Your baby may have craniosynostosis, a disease of the sutures of the skull."