The nurse is talking with caregivers regarding the introduction of new foods to their baby, who has ...

D

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A Incorrect. Regarding the introduction of new foods to the baby, the most important advice the nurse will give the caregivers is not to place up to three foods on the spoon at one time with an old favorite on the front of the spoon.
B Incorrect. Regarding the introduction of new foods to the baby, the most important advice the nurse will give the caregivers is not to introduce vegetables first, introduce one new vegetable per day until all vegetables are introduced, and then introduce fruits.
C Incorrect. Regarding the introduction of new foods to the baby, the most important advice the nurse will give the caregivers is not to start feeding fruits and vegetables very slowly, one spoon per day.
D Correct. Regarding the introduction of new foods to the baby, the most important advice the nurse will give the caregivers is to introduce one new food at a time at 4- to 7-day intervals.

This is exactly what I've been wanting