Of course the answer to this depends on what you mean by "trans kid".
(That's obvious, no? -- Let's spell it out: If "trans kid" means "a child with three metre long arms", then, no, trans kids don't exist. If "trans kid" means "a boy in pink pyjamas" or "a girl wearing a blue nightdress", then, yes, trans kids certainly exist.)
So what do you mean by "trans kid", hmm, @Pitta567?
If by "trans kid" you mean "a child born with a girl's body who is actually a boy", then no, no such kids exist. If you mean "a girl whose parents wanted a boy", then, yes, such kids do exist. (Do you agree?)
There are different ideas about what a trans kid might be, don't you see, @Pitta567? So really your question as it stands can't be answered. Please try to say what you think a "trans kid" is, then you might begin to understand more about what's at stake here.
(Oh, and "monsters aren't real" you said earlier. Depends what you mean by "monster", again, of course. For instance some would say only a real monster would deliberately sterilise his daughter with off-license drugs at the age of ten. What d'you think?)