Alceste
Vagabond
No matter what by the time the child is 5-18 people will figure out the gender then what was the point of that.
The point is not to keep anybody from knowing the gender of the child, but an effort to protect the child from the influence of societal gender conditioning until after (s)he develops a tangible, genderless sense of self. That's not a very long time in terms of psychology. It starts around 2.