Last summer I went camping with my family, and my little cousin was with us. I'm still closeted about this entire FtM issue, and I don't dress stereotypically "masculine" to set radars off, but throughout the entire trip, my cousin, who is six years old, kept calling me with male pronouns.
My mother and aunt kept "correcting" him, but he would always say things such as "Can't you see that he's a boy? I don't get it". I honestly don't know how he came to this conclusion, but it delighted me a bit, even though it was probably just some sort of coincidence. We talked to him and his mother through Skype about a month ago, and he still considers me a male.
People act as if children are clueless, but do you think that somehow they can pick up on these things not only within themselves, but other people due to a lack of bias that adults tend to carry?