How long does a newborn usually sleep on its side?

Newborn babies advocate lying flat, sleeping side also has certain benefits: First, side sleep can reduce the occurrence of aspiration, asphyxia and aspiration pneumonia, because the newborn baby's stomach is horizontal, and the cardia sphincter at the esophageal interface is relatively loose, easy to produce milk overflow, choking milk after feeding, so after the baby feeding, each time hold the back to let the air exhaust, and then side sleep, side sleep mainly on both sides, left and right exchange sleep, and each lateral time not too long, 20-30 minutes can be. Second, side sleep can adjust the baby's head type, help sleep head type, the baby's skull is soft, if you sleep in one direction after birth, the baby's head will sleep tilted phenomenon, it may also cause to show one side face big, one side face small, so you can properly give the baby side sleep, exchange bilateral sleep, generally not more than half an hour or so, help the baby sleep head type.