* Heat development: Local tissue absorb the ultrasound energy and increases the temperature of those tissues
That's a big issue right there. Ultrasound waves can generate excess heat if it's not used properly, or if one does not understand the mechanics of how ultrasound energy transfers to a picture.
If he doesn't know what he's doing, while setting the machine on the appropriate (and safe)parameters in order to see the fetus, he might end up cooking that kid, as well as damage surrounding tissues of his wife.
Does Tom Cruise take Aetna?