Human beings, too, are mammals, and fertilization and development take place within the mother. The period of development or pregnancy is nine months. At birth the muscles contract and push the child through the birth canal (vagina) into the outer world. The human mother can bring more than the simple animal instincts to the aid of her new-born child. Real motherhood develops by the addition of knowledge and understanding to the mother's instinctive love.
American Social Health Association
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“The Baby ,” Gallery, accessed September 28, 2020, http://gallery.lib.umn.edu/items/show/57.