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Natural Expression^™ is the only research-based breastpump technology that mimics a baby’s nursing rhythm—designed for faster let-down and milk flow.


Natural Expression is based on an in-depth study by leading lactation researcher, Dr. Peter Hartmann, Ph.D. Hartmann’s research showed that a breastfeeding baby has a characteristic sucking pattern that begins with rapid, high frequency sucking and changes abruptly to a slower suck/swallow pattern at the time of milk ejection. Hartmann’s research also demonstrated that a breastpump using two-phase cycling, which most closely resembles a baby’s nursing rhythm, is more effective in breast milk removal than single-cycling breastpumps.

Initially developed for hospital breastpumps, Natural Expression uses two pumping patterns to mimic a baby’s nursing rhythm more effectively than ever before. During the “Let-Down” mode, the pump mimics a breastfeeding baby’s initial rapid nursing action that stimulates the milk ejection reflex (MER) or “let-down” and quickly begins milk flow. Once milk begins to flow, moms switch to the second mode, called “Expression,” which mimics the infant’s longer feeding cycle in which slower, deeper suckling helps to maximize milk flow in less time.


Together the two rhythms of the Natural Expression pumping pattern make for a comfortable and authentic pumping experience that is more like a baby than any other pump.

The Symphony^® Breastpump

Natural Expression pumping technology is available in the Symphony, a hospital-grade pump available for home use on a rental basis . The Symphony features a one-touch “let-down” button that allows moms to easily switch from the “Let-Down” mode to the “Expression” mode if she experiences an early MER, providing the most efficient results on an individual basis. Other features include unique external software in the form of a microchip “smart card” that allows for the future development of customized program cards, so each mom could have a program designed to meet her needs.

Pump In Style^® Advanced Breastpump
Natural Expression pumping technology is also available in the Pump In Style Advanced, the most recent addition to the Pump In Style line of electric personal use pumps ideal for full-time use. Pump In Style Advanced features a one-touch “let down” button and customized pumping with speed and vacuum control. The pump in style advanced features a stylish shoulder bag or back pack that contains everything moms need to pump, including a Battery Pak for pumping anytime, anywhere.



The Harmony^™ Breastpump
Harmony is the only manual pump with breakthrough Natural Expression pumping for maximum milk flow. Moms can easily switch from let-down mode to expression mode by switching from one side of the handle to the other. Harmony feels more like your baby than any other manual pump, and is ideal for occasional use.