There has been some interesting psychological research into insecure attachment styles in children (https://en.wikipedia.org/wiki/Attachment_in_children https:/

There has been some interesting psychological research into insecure attachment styles in children (https://en.wikipedia.org/wiki/Attachment_in_children https://en.wikipedia.org/wiki/Attachment_in_children has a good overview). In short: It's good for children to be upset and afraid of new situations. That's how they learn that they can rely on their caregivers, who ideally support them in overcoming those situations. Children that lack this mechanism (and e.g. are disinterested in new situations, or completely overwhelmed by them to the point where they cannot act at all) potentially lack that skill in adulthood as well.