Being stressed or in a hurry can make it more difficult to release your milk and can also affect your milk supply. The Avent Manual Breast Pump has been designed to increase your comfort when you are pumping. The patented soft 5-petal massage cushion stimulates gently and is intended to help stimulate natural let-down. The gentle-draw vacuum mimics a baby's natural suckling action. In fact, a clinical study demonstrated the Avent Manual Breast Pump to be just as effective as a hospital grade electric pump. In the same study, mothers rated the Avent Manual Breast Pump as more comfortable and pleasant to use. Since it requires no electricity, the Avent Manual Breast Pump is portable and quiet enough to use discreetly. The result is a pump that works naturally to provide efficiency - giving you the flexibility to continue breastfeeding your baby. The Avent Manual Breast Pump is BPA free.