2. "I'll buy plenty of pureed spinach so she gets enough iron."
Explanation:
When an infant is about to transition to solid foods, the parents need to gradually change the infant's diet from pure liquid into a pureed whole foods. (since the baby hasn't developed a strong enough teeth to break down foods with hard texture).
Pureed vegetables or baby biscuits are often used by the majority of parents during this time period. Saying that sentence indicated that the parents understand the nurse's advice and about to implement it soon.