If it was a baby of mine, then I would let it be what it was. Time will tell what the kid wants.
A kid comes the way it comes. And deserves love for what it is.
Healthreasons are OK for parents to decide on operating.
Gender, no, so personal, and so pervasive, not the parent's to decide.
If the outward gender is not clear, chances are that the mental gender is not clearly defined by DNA either.
And what if the DNA is not clear?
The kid may be OK with being an inbetween gender person as an adult too.
Would be good if the kids got a hormonal break at puberty, if they need more time to think on what they want to be.
Some kids will know really early though. Just like some kids know really early they have the wrong sex.
A three year old intersex kid that knows he is a he, has the right to get a penis I think.