(dailyRx News) Placing babies on their backs to sleep reduces the risk of sudden infant death syndrome. But sleeping on their backs may make it easier for babies to develop a flat spot on their heads.

A recent study found that nearly half of all babies in one city had some form of flat head syndrome. It’s possible this finding represents similarly high rates of flat spots on babies’ heads in other geographic locations.

Most cases in this research study were mild, and the condition is easily treated if parents are aware of it.

The study, led by Aliyah Mawji, RN, PhD, of the School of Nursing at Mount Royal University in Calgary, Canada, looked at how common it was for babies to have a flat spot on their heads.

The medical name for a flat spot is “positional plagiocephaly,” also called flat head syndrome. It occurs when a flat spot develops on the head, usually from a sleeping position, and causes the head to be asymmetrical.

The condition is not usually serious, but untreated cases can lead to permanent changes in the shape of the head or facial features.

Typically, treating this condition involves slightly altering a baby’s position while the baby is asleep. Sometimes physical therapy or wearing a special baby helmet is recommended.

Babies should also continue to get plenty of tummy time, or time spent on their stomachs, during waking hours, as this helps promote neck muscle development.

In this study, researchers investigated 440 healthy babies who had all been born at full term (at least 37 weeks of pregnancy) when they attended their 2-month well-child visits.

The babies were from 7 to 12 weeks old and went to their well-child visit at one of four clinics in Calgary, Canada.

Nearly half these babies — 205 of them, or 47 percent — had some form of flat head syndrome.

Most of the cases (78 percent) were mild, and 63 percent of babies had the flat spot on the right side of their heads.

The researchers suggested that the high number of babies with a flat spot on their heads may be a result of the change in sleeping guidelines in 1992.

That year, the American Academy of Pediatrics began recommending that babies be put to sleep on their backs to reduce babies’ risk of dying from sudden infant death syndrome (SIDS).

Canadian pediatricians recommended the change in 1999, and SIDS deaths in both the United States and Canada decreased.

The authors do not suggest changing those recommendations; babies should still be placed to sleep on their backs to reduce SIDS risk.

However, parents should be given information on preventing flat head syndrome, such as ensuring babies’ position is altered during sleep.

The study was published July 8 in the journal Pediatrics. The research was funded by the University of Calgary. The authors declared no conflicts of interest.