[wolframarnold]

What I find missing from this discussion is the safety aspect of wholesale ultrasound. Yes, we've been told they're perfectly safe. That was once said of x-rays as well and physicians were routinely x-raying fetuses in the uertus up until the 1970's. That was before the evidence of birth defects from exposure to x-rays became so overwhelming that the practice finally stopped.

See http://sarahbuckley.com/ultrasound-scans-cause-for-concern and references quoted therein for a good overview of the current discussions on side effects of routine ultrasound screening, including tissue damage due to cavitation and hearing loss in fetuses.