M - True Child MC

The MC named Tiel is a child who, at the age of seven years old, died due to abuse and went back in time just a month.

The MC is a child; her mother is the one who reversed time and remembers their previous lives.

Personally, I hate the mother and can't get past the fact that she said she'd change after what she did to the MC, but the only change she made is that she had sex with the emperor 24/7. She still ignored her daughter, stole her money to go see the emperor, and didn't care about her daughter as she was too busy having sex.

The MC is a child who, as the title says, leaves the orphanage to find his mom. He doesn't speak because he's traumatized due to how he was recovered, as the aliens didn't know that he was being raised by animals when they took him away.

I'm not sure if I can consider this a true child FL; however, the FL is a dog who transformed into a human to be with their owner for an extra five years after their death as a dog. But the FL acts like a true child, or rather a true puppy.

Groo is a true child; there’s no time travel, no past life, or anything of that sort, or at least there’s nothing that Groo can remember; she acts like a true child and doesn’t use adult logic.

The MC is a true child; it seems as if she and her mother were stuck in the modern world for a few years, but she doesn't remember any of it.

The Female Lead is a normal child who doesn’t know anything; however, her maid is someone who either reincarnated into the world or got reborn there, as she knows the future and that the Female Lead is meant to be a villainess. Though we only see memories of the maid since she's in the demon realm and the Female Lead went to the human realm.

While the female lead is technically reborn, by the 6th chapter she seems to have forgotten all the memories of her past life, so I would count her as a true child.