The depth of ultrasound penetration during pregnancy has been linked to autism spectrum disorder in offspring in a recent case-control study, suggesting that ultrasound scans may not be as benign as was once thought. Investigators looked at the number and timing of ultrasound scans, as well as their duration of exposure, and mean strength when performed in each trimester and during women’s entire pregnancy. Among 420 participants in the study with a mean age of 6.6 years, researchers compared 3 subgroups: children with autism, those with developmental delay, and those with normal development. Researchers noted that the autistic children were found to have been exposed to greater depth of U/S penetration during the first and second trimesters, when compared to normally developed children.