Children are often more clever than adults give them credit for; don't assume they don't understand anything. Children of similar age can communicate through their spirits, and a single look can be enough. Just like adults, children have a sense of shame, and fear being looked down upon.
Receiving the little sister's angry glare, Yazhi calmly placed her little finger on her hair, stroked it, and then looked at the medical brothers and sisters without feeling the slightest bit of fear.
Cao Yong watched the child and knew clearly whose doing this was.
Children are scared when they come to the hospital mainly because it's unfamiliar. If there could be someone to make the hospital feel as warm as home, why would the children be scared?
Just look at how the child occasionally glances down at his little apprentice sister; it's obvious that she had done a lot of foundational work with him regularly.