'Tis the Instagram generation.
People should keep in mind when they spend time and money setting up an 'event' to post to their social media: Very few people care all that much. Really.
Knowing the sex of your baby is of interest only to your nearest and dearest. And even then, aside from the die-hard shoppers, most people can wait. It gives them a question to ask about the newborn, aside from it's weight.
I was raised in an older time, when you couldn't find out the gender beforehand. (Yeah, the dark ages.
)
There were a lot of women who wouldn't even mention their top name choices because it was 'bad luck'. Some sort of 'evil eye' effect, that the more you thought you knew what was coming, the likelier it was for your hopes to be dashed. And with an unborn baby, why chance your luck?
Better to chant that mantra "We'll be happy with whatever we get", or indeed, "As long as it's healthy".