i.e. by bearing or fathering a baby. It doesn't have to be their first baby, and it doesn't have to be a natural birth. It does however have to be their genetic child. Surrogates or similar technology who are not president are fine, as long as the baby who is born is the genetic descendant of the president. This claim is only concerned with biological parenthood, not adoption. The birth must happen while this person is in office.