Final answer:
The statement by the parent that indicates an understanding of how to manage gastroesophageal reflux in an infant is ensuring the baby is burped frequently during and after feedings, which helps reduce reflux symptoms.
Step-by-step explanation:
The correct statement by the parent that indicates an understanding of the teaching about gastroesophageal reflux in a 4-month-old infant is: "I'll make sure to burp my baby frequently during and after feeding."
This practice helps to release any trapped air swallowed during feeding, which can reduce the discomfort and the frequency of reflux episodes.
Laying the baby down right after feeding or keeping the baby in a reclined position could actually promote reflux. Introducing solid foods to help with reflux is generally not advised at 4 months of age, as infants typically are not developmentally ready for solids until closer to 6 months, and it could potentially worsen reflux symptoms.
Therefore, the most appropriate measure for reducing gastroesophageal reflux is ensuring the baby is burped adequately during and after feedings.