That's perfect. I love it. I had one friend who really didn't tell anyone the sex of their child until the child was old enough to assert gender. The name they were given was deliberately gender-ambivalent in this time, and the child finally spoke about it at 5. Asked if they wanted a different name, they declined, saying they liked their name. And I'm deliberately not saying what their gender is, because it doesn't matter.
My friends explicitly did this on the off chance their child was trans, so that there would be no history for the kid to live down if they decided to transition or change their name.
I love that so much. THAT is allyship.