Children are little individual human beings, not science experiments created to satisfy some warped desire the parents have to show how liberal and modern they are. This is abusive in the extreme. It’s hard to imagine how any of these children will grow up, but especially the one who is being denied the most basic identity.
You are so right.
Having been the mother, grandmother, aunt, and babysitter of many boys, I can tell you that boys learn the basics about their gender before they learn to crawl.
They are all very happy to discover the premiere sign, as well. ;-D