Pacifiers do not directly create gas in infants, according to Dr. Robert Boughan, who practices internal medicine and pediatrics at Mercy Medical Center in Baltimore. Gas can be produced, however, if the baby swallows air as a result of repetitive sucking of the pacifier. To reduce the amount of air swallowed, examine the pacifier. “It is important to make sure that the pacifier is the appropriate size for the baby," said Boughan. He noted that the shield around the base of the pacifier should cover the mouth and the silicone or latex plug of the pacifier should not be damaged.