* Jeune: This is the most common and general term for "young." It can be used for people, animals, and things.
* Enfant: This means "child" and is used specifically for young humans.
* Petit: This means "small" and can be used for things that are young or small in size.
* Jeune fille: This means "young girl."
* Jeune homme: This means "young man."
Here are some examples:
* Elle est jeune. (She is young.)
* Le chien est jeune. (The dog is young.)
* Le jeune homme est intelligent. (The young man is intelligent.)
* La jeune fille est belle. (The young girl is beautiful.)
* L'arbre est petit. (The tree is small.)
The best word to use will depend on the specific context.