What kind of breast pumps are neaded to stimulate milk production?

Most often the term used to recommend a breast pump is "hospital grade". These breast pumps are double pumps meaning that both breasts are being stimulated at the same time and plug into the wall for power. This reduces the amount of time the woman has to spend with the pump. They also provide consistent suction without harshly pulling at the breast. Using a small hand powered pump is fine for occasionally expressing milk but it is best to use a larger better quality pump for this type of stimulation. Of course a quality pump is more expensive to purchase or rent but it is well worth the cost for both comfort and ease of use.