After a feeding (laying down position) my baby starts gasping and making a wierd noise as he does so, what could this be? (he isnt in pain or crying)

GER: Gastroesophageal reflux is common in infants until their esophageal sphincter develops, and are prone to increased symptoms after feeds, while laying flat, with pressure on the abdomen and with rapid position changes. Common symptoms include spitting up, nasal congestion, fussiness, gagging/coughing and more. GER is usually not associated with cyanosis, so see your doc for color changes during.