The first female was created from the rib of a man. Feminine adjectives, on the other hand, are normally created by appending an e to the end of the masculine adjective (Regular Adjectives).
C'est un petit garçon.
Feminine adjectives aren't, however, all created the same way; they are a diverse lot. Some feminine adjectives have doubled final consonants, others are exact replicas of the masculine adjective (sameness), some undergo bizarre metamorphoses that make them little resemble their masculine counterparts (oddball adjectives).
Plural adjectives are formed by appending an s to the end of a masculine or feminine adjective.
Les lits bleus sont là-bas. (lit is masculine)
There are, however, some plural adjectives which are made differently (Odd