母となる女性の数が少ない。

Meaning
the number of women who become mothers is small

Vocab used in this sentence

mother, my mother, mom, mommy, haha
and, with, if
なる
be, get, become, comes, to become
女性
women, woman, women , lady, female, feminine, females
to, of
few, number, several, count, rate, couple
is, there, but, ga, will, however
少ない
few, less, low, small, little, scarce, seldom, insufficient

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