Karleen, I think it was first estimated at 5% by Neifert, Seacat, and Jobe,
in this paper:

Neifert, M. R., Seacat, J. M., & Jobe, W. E. (1985). Lactation failure due
to insufficient glandular development of the breast. *Pediatrics, 76*(5),
823-828.



--Diana Cassar-Uhl, IBCLC

NY, U.S.A.

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