Hi Sherie, good idea to do research now. I had NO idea about them as I just assumed I'd be BF. Well bubs rejected the boob and I had to hire an electric pump to express to feed to him. I wish I'd done research before. I hired the top-of-the-line medela pump (buying the attachments cost $45) for $30 per month. I would not recommend this unless you needed to express full-time though. And it hurt my boobs!