I've looked at tons of these ultrasounds, and I still don't understand -- what makes this one "stacked" and not just a "fork" at a different angle? Even though the nub is pretty parallel to the spine, you'd still guess boy?
Ya I've given up. I had 4 boys and never knew what I was looking at if they didn't draw around it to point it out. I wish I was a u/s tech lol