I am due 8 September. Somewhere between 16 week and 20 is typical for a healthy baby ultra-sound check up. I was traveling then, so I went in at 21 weeks. The baby looked healthy, but was crossing his/her legs and was laying on its back, so the doctor could not see the spine. Three weeks later, I got my second chance to learn the sex. Today the baby had the umbilical cord between his/her legs, so again, the technician could not confirm boy or girl. "If I had to guess, I would say it is a girl," said the technician. Truly, not that helpful.