A sonogram, or ultrasound scan, can help determine the sex of a baby, but using fetal ultrasound to create keepsakes is not recommended.
Ultrasound measurement learning of fetal sex during the first trimester: does the experience matter? Ricardo Savirón-Cornudella,1 Isabel.
If you have chosen to find out the sex of your baby, you are most likely going to do so via ultrasound. However, there are certain signs in boy and girl ultrasound pictures that the technician uses to determine the gender of your baby. When doing an ultrasound to determine the sex.