If you live in the US I have included a link to the law regarding it. From a biology standpoint your risk mastitis which is incredibly painful, and your supply will give out really fast if you don't regularly pump. Your child's saliva actually enters into your breast and your body responds by creating antibodies for whatever illness they have. You have blue milk when it is hot out and your child is extra thirsty and yellow milk for nutrition also known as fore and hind milk, each kind of milk has a different purpose. Formula can never match that. Express use of human milk for the first two months of your child's life reduces their risk of sids by half. . Insurance companies cover pumps, WIC, SNAP and Medicaid also cover pumps. You might need multiple pumps one battery operated and one full powered work horse for the differing work environments you will face. I was in the Marines so I did it everywhere, on the range, during duty, on my commute to work every day while wearing a special bra to keep the pumps firm against my breasts. I also did it in college with my 3rd child. At work we didn't have a room I could do it in so I did it in the bathroom because that is where an outlet was. While you have every right and protection of the law to pump for your child, people will be bothered by it, though it is none of their business, it is your choice alone and don't be bullied into making a choice that you don;t want to make just because you don't think that you can make another. Breastfeeding is not for the faint of heart. Pump it and dump it if you must and there was one week where I had to do it in an outhouse with my battery powered pump. I disinfected that thing every time I got home and baby had frozen formula all week but you have to keep up your supply or it will give out. A few tips, always bring extra bottles. And use the 9 ounce ones that come with the nipple and top not the 5 ounce ones that come with the pump, when things start to overflow you have to switch the bottle out and you don't have time. I never had time to clean my pump at work I always threw it in the fridge so I knew at least it didn't have spoiled milk on it and cleaned it well when I got home. Get a hospital grade pump, it will save you in medical bills and time off work, it is $700.00 and an additional $200.00 if you must get a battery operated pump also, the lower grade pumps don't work as well. Hospital grade is huge and clunky but totally worth it. I had to resort to a roll on suitcase to get all my textbooks lunch and the pump to school. Kiss up to all your coworkers be as indispensable as possible so that people don't resent you the extra 5-15 minute you may need in the workday. If you can break every 3-4 hours that is ideal for expression. I did it at 5 on my morning commute,7 in our break to shower and eat breakfast after PT, Noon when we had lunch, 3 if I could that was a short one about 5 minutes where I would pump off just enough not to leak through my blouse, smokers do it, my cause was more worthy, and as soon as I got off at 5 or 7 depending on how long the workday lasted. The Medela lactina select is very powerful, has easy to clean parts and gets the job done fast but it does plug in if you are a delivery driver you could get a cigarette lighter socket attachment but if you need something battery operated this pump isn't what will do it though I recommend one pump and a backup pump because stores don't just keep good pumps stocked. For my first two I had the Ameda purely yours double breast pump but a few broke on me with the brittle plastic the actual pump piece was made out of, the pump part was on the inside. What I like about the Medela lactina select is the pump part is on the outside. I loved both of them because cleaning was easy. Don't buy a pump where milk is designed to go through the tubes because cleaning tubes is complicated and something you don't have time to do at work. You have to have a dual pump otherwise it will take forever and people will be mean about it.