Swedish researchers said on Tuesday acupuncture "appears to reduce crying" in babies suffering from colic. But their work was criticised by colleagues in the medical field, with one calling the study methodology "appalling".
A duo from the Lund University's medicine faculty tested the traditional Chinese needle-piercing remedy in a trial involving nearly 150 babies between two and eight weeks old.
They reported their results in the journal Acupuncture in Medicine, published by the BMJ - formerly known as the British Medical Journal.
Compared to babies who did not undergo the needle treatment, infants who received acupuncture over two weeks exhibited "a significant relative reduction" in crying, the team found.
Such research can be controversial. Acupuncture is invasive, potentially painful, and its benefits are not universally accepted.
Organisations such as the British Medical Acupuncture Society says it is used to treat muscle and postoperative pain, as well as nausea. But some think acupuncture's effects are that of a placebo, meaning people feel better because they believe it works.
The National Institutes of Health, the main UN research agency, says there is "considerable controversy" around its value.
Colic affects as many as one in five families, and is diagnosed when a baby cries for more than three hours per day on more than three days per week.
Why it occurs is not well understood. Indigestion, trapped wind and intolerance to cows' milk have been identified as possible causes.
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