This is especially true for babies that are bottle fed who tend to ingest air that gets trapped in their gastrointestinal system. This gas needs to be released and burping is one way parents can help with that.
Read more about causes: http://bit.ly/2njOxOt
Learn more about ways to burp: http://bit.ly/2Go9e3o
Product to consider that might help with your baby's digestion: http://amzn.to/2rP1xjs