Sakura isn't a particularly active child, and he tends to be wary of new situations and people. Although he doesn't cry, he dislikes dealing with novel situations. According to Thomas & Chess, he would be classified as:

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Sakura's behavior of being wary of new situations and people and disliking dealing with novel situations is characteristic of a slow-to-warm-up child according to Thomas & Chess. This type of child takes time to adjust to new situations and people, but eventually, they will adapt.

Sakura Isn't a Particularly Active Child, and He Tends to Be