Hi,

Our sonographer said that it is quite obvious to them by the shape of the pelvic region. But maybe that was just her experience. We did want to know (well DH did and I caved in) and were told within about 2 seconds.

Friends of ours who wanted to know, couldn't be told for sure because the cord was between the legs, but the shape of the area was showing that of a girl, and they had a girl.

As others have said, these people do this all day, so they can tell things from a quick glance.. I know in my line of work, I can get the gist of things from a quick glance, whereas others would have no idea what I was looking at.