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First of all, German has three genders: Masculine, Neuter, and Feminine. You're correct that 'ein' is masculine and 'eine' is feminine. However, 'ein' is also used for the neuter gender. 'Mädchen' is a neuter word. You will find it useful to remember that grammatical gender does not necessarily relate to biological gender.
Be careful here! 'Kind' is a neuter word, not masculine or feminine. Even if the 'kind' is a male or a female, it is still treated as a neuter noun.
- boy: He is a child / Er ist ein Kind.
- girl: She is a child / Sie ist ein Kind.
It's like the word Person (german for 'person', surprise surprise! :P) - it is a feminine word, but even if the person is a man, the word is still treated as feminine:
- man: He is a person / Er ist eine Person
- woman: She is a person / Sie ist eine Person