The phrase "a kid apart" is correct and usable in written English.
It can be used to describe a child who is different or distinct from others in some way, often implying uniqueness or individuality.
Example: "He always felt like a kid apart, never quite fitting in with the other children at school."
Alternatives: "a child set apart" or "a kid distinct from others".
Jay-Z reveals much more about himself: "Now I'm just scratchin the surface/ cuz what's buried under there/ was a kid torn apart once his Pop disappeared/ I went to school/ got good grades/ could behave when I wanted/ but I had demons deep inside/ that would raise when confronted".
When they brought Pour Moi here on reconnaissance nine days ago Fabre had been asked what is was that set the kid apart.
A leading Russian youth coach, Igor Rodkin, some time ago anticipated Dzagoev's impact on the big football stage when he said: "The first thing you know about this kid, apart from his talent, is that he doesn't play football for fame or money but because it is his life.
"The first thing you know about this kid, apart from his talent, is that he doesn't play football for fame or money but because it is his life," Igor Rodkin, a Russian youth coach was quoted by the Independent in Britain.
You look around the streets now and you can spot a chav and a skate kid but apart from that there doesn't seem to be any separation with kids any more.
He'd already done a bunch of cool stuff like climbing mountains and riding horses and whatnot and he found that being able to see was a little bit overwhelming; he couldn't tell his kids apart and his brain couldn't differentiate between men and women so he had to re-learn "how" to see, basically, since he'd gone blind at a very young age.
As the youngest participant, she felt a bit lost at first among the 23 other kids (Apart from Aziz) from all over the republic, ranging in age from 14 to 24 and all with different experiences.
Gosh, he used to tear the other kids apart – the difference in talent was brutal.
Some parents regret choosing too-common appellations that fail to set their kids apart.
"We use our words, not our hands," I then say, as I pull my fighting kids apart with brute force.
