Absolutely a great idea!
In my case my parents decided to leave things alone when I was born. I have obvious inadequacies in the men's department. In many cases this condition was corrected at birth by surgery.
I was coached into "be a man", and "don't be a sissy" clear up until puberty. Puberty brought "breasts and curves", still my parents fought it.
I regretfully lived most of my adult life living a life that was not mine and resenting my parents decision. They could have opted for other options but they chose not to.
Not to say surgery would have been the best choice for all children born intersex like me, but in my case it was.
Later testing (ultrasound) confirmed I have a uterus and fallopian tubes.
That being said, the choice should have been mine to make and not my parents.
Opting out of surgery shouldn't have happened, rather postponed until I could make that decision myself.
The doctor is offering just that. Leaving the choice to your child to make later in life based off of what they see. No sense trying to squeeze everyone into one of two boxes if God made them something different.