Children are BORN with confidence. The have no fear of anything, until they are given a reason to fear something.
For instance, children aren’t afraid of heights until they fall, or they witness someone else fall, or are convinced by another person that they should be afraid of falling. Children aren’t afraid of strange animals until they are bitten, see someone else get bitten, or are convinced by another person that approaching a strange animal could result in physical harm. With no outside influence, children are CONFIDENT.