Infant reflux, commonly known as spitting up, happens when food moves back into the esophagus from a baby’s stomach. It happens in healthy infants and is usually not a cause for alarm. It usually stops after 18 months of age. Reflux can be exasperated when babies lie flat for much of their day. Premature birth and consumption of an almost completely liquid diet can also contribute. There are some ways to minimize reflux such as feeding the baby in an upright position, trying smaller and more frequent feedings, taking time to burp the baby and putting the baby to sleep on his or her back.