Dr. Robert Hamilton Pacific Ocean Pediatrics in Santa Monica, California has been working at his craft for 26 years. He knows all about caring for children, including how to get upset babies calm. When they get painful injections at his office, he uses a particular technique that soothes them almost instantly.
You can skip to the 1:01 mark in this video to see Dr. Hamilton use what he calls "the Hold." Pick up an infant according to it and, as Dr. Hamilton says, "shake their booty."
-via Twisted Sifter