Here's why:
* Capitalization Rules: In English, proper nouns (names of specific people, places, or things) are capitalized. Common nouns, like "maiden," are not capitalized unless they are at the beginning of a sentence or part of a title.
* Context: In the poem, "maiden" refers to a general concept, not a specific character. The speaker is talking about the universal experience of a mother's love for her child, and the word "maiden" is used to symbolize the youthful innocence and vulnerability of the child.
If you're referring to a specific line from the poem where "maiden" *is* capitalized, please provide the line so I can give you a more accurate answer.