They have to act like a normal child so people don't think they're possessed.
Don't just list facts. Describe the physical sensation of two lives colliding: 1 : I Recalled the Memories of My Past Life...
Once the memories settle, your lead needs to evaluate their current reality: Am I a noble? A peasant? A monster? They have to act like a normal child
High-pitched ringing or a blur of images (subway trains, office lights, a hospital bed). 1 : I Recalled the Memories of My Past Life...
"I remember why I died... and the person who killed me is in this room."
Feeling the grief of a previous death while simultaneously feeling the small, young body they are currently in. 3. The "Wait, Where Am I?" Moment
Realizing they have parents or siblings they didn't have before. 4. The Immediate Goal