Persistent demand on the breast is a most important and continually neglected factor in the establishment, maintenance and reinstitution of natural or breast feeding.
Normally, the flow of breast milk in the puerperium is supposed to be brought about by the hormones set free just before the milk "comes in." I have had no personal experience in the establishment of lactation without a preceding pregnancy. Many dependable authorities, however, vouch for the possibility of such a phenomenon when proper demand is made on the human breast, either male or female. Pfaundler's report of a calf which was suckled by other animals and produced normal cow's milk may also be cited as supporting the correctness of the cases reported among human beings.
The premature infant is usually incapable of furnishing the physiologic sucking stimulus necessary to support the hormones. When the importance of the continued demand on the breast is underestimated,
SEDGWICK JP. ESTABLISHMENT, MAINTENANCE. AND REINSTITUTION OF BREAST FEEDING. JAMA. 1917;LXIX(6):417–418. doi:10.1001/jama.1917.02590330001001
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