Yes, it is possible to select the biological sex (male or female) of a baby during IVF using preimplantation genetic testing (PGT) to screen embryos for XX (female) or XY (male) chromosomes before transfer. This often is done for medical reasons, such as avoiding sex-linked diseases, or for family balancing, to have an equal number of boys and girls in the family. Whether such selection is ethical is a source of debate, and the availability of sex selection for IVF varies by clinic and country.
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