In Guatemala they put coffee in baby's bottles! 
To reply to an earlier comment, no, science doesn't change it's 'mind', but different studies may have results that appear to contradict one another. The way that science is then reported in the media may flip-flop, but the science itself (testing a hypothesis by collecting data under controlled conditions) has not changed.
As an anecdote, I have just 'had' to burp dd2 3 times within a 10 minute feed to allow her to expel an air bubble and continue feeding. Each time, she came off the same breast - presumably because she had taken in enough air to fill her tummy without actually being full of milk (we are still working on latch after her posterior tongue tie and upper lip tie was revised last week). It is conceivable that she didn't need me to do this but in my experience, laying her down to sleep without burping results in her waking early due to hunger, and also vomiting more often than if I'd kept her upright for a few minutes and gotten a burp out of her first. (Incidentally, are there RCT supporting the practice of keeping baby upright for 20 minutes after a feed? No? But the NCT still advise it, and I gratefully accept this anecdotal advice, much as I am doing here re burping. I don't feel it is diminished just because there are no double-blind, peer reviewed studies to support it).
If I didn't burp my dd regularly to rid her of those 'filling' pockets of air that she's ingested, the process of feeding her would take much much longer, leading to less (quality) sleep for her and for me. Sometimes, all I needed to do to actively burp her was to pick her up and put her on my shoulder. Sometimes, I needed to use an additional method - and have tried out some of these fab suggestions here, thank you so much for all your input!
My lonely night feeds have been enlivened by trying out these new techniques!
Claiming that babies don't need burping (because YOUR baby doesn't) is at best, naive, and at worst, actively unhelpful to those of us who experience otherwise.