they ar usually right especially if the baby is lying at a good angle and you could get to see for yourself. i didnt ask about my first child but when i had the scan and they were describing what i was seeing on the big scan i just had to look and see when they went over the bits! saw there was girlie bit and definately no boys things there. and same with my son we asked and they showed us that we were having a boy. you coule see his not so little boys bits very clearly on the scan. i know they will also tell you that they are only say 80 % sure but its only to cover their backs as someone sued years ago after being told it was a girl buying a shedload of pink and getting a boy or vice versa!