A nurse in a provider's office is reinforcing teaching with the parents of a 4-month-old infant about introducing solid foods to the infant's diet. Which of the following statements by the parents indicates an understanding of the teaching?

A: Introducing fruit juice at 4 months old is not recommended because infants' digestive systems are not yet ready for such foods, and it can increase the risk of tooth decay and obesity. B: Introducing eggs at 6 months could be appropriate; however, it is not the best choice as it does not reflect the gradual introduction of new foods one at a time, which is essential to monitor for any allergic reactions or food intolerances. C: Offering cereal with a percent of milk is not advisable for a 4-month-old infant as cow's milk should not be introduced until the child is at least 12 months old due to the risk of iron deficiency and potential allergies. D: Offering a new food every 7 days is the correct approach as it allows parents to introduce new foods gradually and monitor the infant for any adverse reactions or allergies, which aligns with the guidelines provided by health authorities.