Re: Elective 3d/4d ultrasounds
We are not doing any unnecessary ultrasounds, because as some of the PPs I think there is still lots we don't know about them. I mean they used to xray pregnant women to check the size of their pelvis before we knew that was bad! What we do know is that it is uncomfortable for babies because of the sound waves and they tend to avoid it, and that it heats up tissues.
We did choose to do the anatomical US at 20 weeks however, mostly because it was very important to DH. I would especially not use one of those "for entertainment" places. Of course, everyone can decide this for themselves! This is just my take on it.