The aggressive and hateful responses to these people (not just on here, but below the article itself) show the single drawback to not placing focus on a child's gender, and instead allowing their personality to develop without the societal constraints that go hand in hand with the gender label: It's an issue of other people being bigots, not an issue of the parents being jerks.
By the way, the original and full story is a bit more informative. Here are two quotes I appreciated from it:
"This past winter, the family took a vacation to Cuba with Witterick’s parents. Since they weren’t fluent in Spanish, they flipped a coin at the airport to decide what to tell people. It landed on heads, so for the next week, everyone who asked was told Storm was a boy. The language changed immediately. “What a big, strong boy,” people said.
The moment a child’s sex is announced, so begins the parade of pink and barrage of blue. Tutus and toy trucks aren’t far behind. The couple says it only intensifies with age.
“In fact, in not telling the gender of my precious baby, I am saying to the world, ‘Please can you just let Storm discover for him/herself what s (he) wants to be?!.” Witterick writes in an email."
“When faced with inevitable judgment by others, which child stands tall (and sticks up for others) — the one facing teasing despite desperately trying to fit in, or the one with a strong sense of self and at least two 'go-to' adults who love them unconditionally? Well, I guess you know which one we choose.”