A nurse is caring for an infant who has gastroesophageal reflux (GER). Which of the following actions should the nurse take to prevent regurgitation? (Select all that apply.)

A. Thicken the infant's formula with cereal: Thickening feeds can help reduce reflux by making the formula heavier and less likely to come back up. B. Avoid giving the infant citrus juices: Citrus juices are acidic and can worsen reflux symptoms, so they should be avoided. C. Position the child with their head elevated after meals: Keeping the head elevated for 30 minutes post-feeding helps prevent regurgitation due to gravity. D. Place the infant's head on a soft pillow while sleeping: This increases the risk of SIDS. Infants should be placed on a flat, firm surface without pillows. E. Administer an antiemetic to the infant: Antiemetics are not routinely used for GER in infants and are not first-line management.