I would say, "Wait until this confused child hits puberty -- all that will change"; however; fiendish parents such as these and medical "caregivers" are now pioneering the use of hormones on young children to SUPPRESS their natural puberty so they can stave it off until they can undergo the expensive and traumatic butchering of their private parts. Barbaric.
That said, I don't know whether this particular pair are planning to do this; but after they hit the talk show circuit as a result of this publicity, it's highly likely.
Here's a link to a tragic story of a person whose sex was "changed" by medical science in childhood:
What were the real reasons behind David Reimer's suicide?
For Dr. Money, David was the ultimate experiment to prove that nurture, not nature, determines gender identity and sexual orientation—an experiment all the more irresistible because David was an identical twin. His brother, Brian, would provide the perfect matched control, a genetic clone raised as a boy.
David's infant "sex reassignment" was the first ever conducted on a developmentally normal child. (Money had helped to pioneer the procedure in hermaphrodites.) And according to Money's published reports through the 1970s, the experiment was a success...[but the] reality was far more complicated...
[Note: I did NOT make up the name "Dr. Money."]
They will likely start this boy on sex change hormones before he hits 10 or 12. They will have therapists and others encourage him to NEVER EVER want to change back. The pressure on him to be transgender will be enormous.