Breast pump is a tool used to express breast milk that has accumulated in the breast. It is generally applicable when the baby cannot suck breast milk directly, or when the mother’s nipple has problems, and even though she is working, she still wants to breastfeed. There are electric breast pumps and manual breast pumps. Manual type is divided into push type, simple rubber ball suction method and syringe type. The electric type can be divided into stimulating milk array and non-stimulating milk array, as well as single pump and double pump.