Even among the women surveyed who lay on their right, the risk remained extremely small Experts want urgent research to see if the position a woman chooses to sleep in during late pregnancy affects still-birth risk, as a study suggests a link.
The University of Aukland compared 155 women who had late still-births with 310 who had healthy pregnancies.
Sleeping on the right side or back doubled, but only to almost four in 1,000, the risk of left-sided sleepers.
Left-side lying aids blood flow to the baby, as the mother's major blood vessels are unimpeded by a heavy womb.
The New Zealand study, published in the British Medical Journal, called for larger studies to test the findings.
Ms Daghni Rajasingam of the Royal College of Obstetricians and Gynaecologists said: "There are many factors which are linked to still-birth including obesity, increasing maternal age, ethnicity, congenital anomalies and placental conditions. A significant number are unexplained.
Janet Scott of the stillbirth charity Sands“We would like to see further research into sleep in pregnancy encouraged and funded as a matter of urgency”
"This small-scale study looks at another possible factor. However, more research is needed into sleep patterns before any firm conclusions over sleeping positions can be made.
"In the meantime, women should speak to their midwives if they are concerned."
The UK has one of the highest still-birth rates in the developed world. Every year here 4,000 babies are still-born.
A third of still-births have no clear cause.
Janet Scott, of the still-birth and neonatal-death charity Sands, said: "We would like to see further research into sleep in pregnancy encouraged and funded as a matter of urgency.
"The study will require further validation before any widespread public health campaign could be justified.
"Mums want to know what they can do to reduce the chance of this happening to their baby.
"A simple message which mums could follow, which would reduce their risk of still-birth, would be very welcome."
This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.
Source: http://www.bbc.co.uk/go/rss/int/news/-/news/health-13766152
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