What does les petit mean?

Answer 1

"Le petit déjeuner" means the breakfast.

Answer 2

Le Petite means "the small" or "the little"

This is incorrect French - it should be - la petite which could could mean a little girl - but perhaps you mean l'appétit - appetite.

Le petit is the masculine form for a boy.

La petite is the feminine from for a girl.

both mean "the small" or "the little" but one is for when talking about a masculine word or a boy and the other is for a feminine word or a girl.