But why do we burp?
Babies are also subject to accumulation of gas in the stomach while feeding, and this can cause considerable agitation and/or discomfort to the child unless it is burped. The act of burping an infant involves placing the child in a position conducive to gas expulsion (for example holding the infant up to the adult's shoulder, with the infant's stomach resting on the adult's chest) and then lightly patting it on the lower back so that he or she burps.
The Ins and outs of burping.http://www.kidzworld.com/article/756-the-ins-and-outs-of-burping
Why do I burped?http://kidshealth.org/kid/talk/yucky/burp.html