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An 8-year follow-up study from a randomized, controlled trial of repeated prenatal ultrasound examinations found no evidence of any lasting harm to any aspect of child development.
The initial study demonstrated that infants exposed prenatally to five ultrasound imaging studies between 18 and 38 weeks' gestation had a significantly greater risk of low birth weight than children exposed to only a single ultrasound at 18 weeks of gestation.
Included in the follow-up analysis were 1,352 children who previously had been randomized to the regular ultrasound group and 1,362 children randomized to the intensive ultrasound group (Lancet 2004;364:2038-44).
After 8 years of repeated follow-up examinations, children in the two groups showed no statistically significant differences in a wide variety of developmental measures. These included measures of physical growth, toddler temperament, language development, and behavior, reported John P. Newham, M.D., of the University of Western Australia ...
Source: HighBeam Research, No lasting effects from repeated ultrasounds.(Obstetrics)