In order for your baby to properly extract the milk from your breast, her mouth must be open wide (really wide) and take in much more than just the nipple. (rivertownmamas.com)
It does most of the work and can extract milk fast and efficiently. (babygearsguide.com)
A mother who chooses a manual breast pump will need to help extract the milk into the pump. (babygearsguide.com)