A nurse is reinforcing teaching with a parent of an infant who has gastroesophageal reflux. Which of the following statements by the parent indicates an understanding of the teaching?

"I will have to feed my baby formula, rather than breast milk."

"I should move my baby into a side-lying position during sleep."

"My baby's formula can be thickened with oatmeal."

"I will keep my baby in an upright position after feedings."