Here is an excerpt from the text book "Breastfeeding and Human Lactation" by Jan Riordan (p. 207).
Although many women in the United States think first of using a breast pump to obtain milk, expressing milk by hand is a skill that has been used by many mothers for millennia. The mother’s own hands represent several advantages over breast pumps:
- They cost her nothing.
- They may trigger a more effective milk ejection reflex.
- They are always available.
- They compress the breast for milk removal.
After the mother has practiced this skill, she may find she can obtain more milk more quickly than women who use and electric device for the same purpose!"