Yes, I thought that too! I can't imagine that the sonographer just volunteered her opinion on the sex of bub - I put it down to ultra-keen first-time parents hassling!

I don't want to ask if it's actually a little silly to, if the genitals are just a bit too ambiguous...

ETA Rae: the sonographer told them she thought she saw boy genitals. I was amazed, the genitals only start differentiating at about 11w, I think