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Ultrasound imaging performed in the 11th and 12th weeks of pregnancy for fetal  The fetal gender can be identified even in the first trimester of pregnancy. Conclusion: Fetal sex assignment in the late first and early second trimester can be useful in pregnancies at risk for severe sex-linked diseases, in fetal disorders. Hamburger Sign. When doing an ultrasound to determine the sex of your baby, an ultrasound technician will actually look for girl genitalia—labia and clitoris. Doctors can usually determine the baby's sex during a routine ultrasound visit at this time, but not always. RELATED: What to Expect in the First.