Quote Originally Posted by lizzie View Post
But suction and forceps are used at the end of pregnancy, while ultrasound is often used very early in pregnancy, during critical periods of development. That's the primary reason I wonder if it causes harm.
The tools used in delivery can cause minute damage to the brain, as babies skulls are soft. That would also affect their development. The labor rooms in hospitals these days tend to avoid natural delivery and the tools used to withdraw the baby faster can be harmful.

Pre-natal ultrasound is not risky. Babies are exposed to the sounds of the outside world through the womb, such as their mother's voices, music, etc. If sound could harm the embryo we'd be seeing cases of it already.