T.!
You've got some great advice. I returned to work when my DD was 3 months old - I went back part-time, but I still had to provide 2-3 servings of milk for the three days that I worked.
1. I used the Purely Yours breast pump. This was perfect for part-time work, but I would recommend the Medela if you are returning full time.
2. Do you know where you'll be pumping at work? This is FAR more challenging than you think right now. Please don't get me wrong; women do it - you can do it - but there will be days when you'll want to quit. Try to mentally prepare yourself.
3. Expect to spend 30 to 45 minutes for each pumping session at work - that includes walking to the room you'll pump in, setting up the equipment, pumping, storing the milk, cleaning up the equipment and returning to work. You'll be doing this every 3 hours. That means you need to stop working every 2.5 hours while you're at work.
If you're busy at work - say, in an important meeting - and you want to skip a pumping session, you can't wait too long. Not only will your breasts start to throb because of the build-up of milk, but you will put yourself at risk for plugged ducts and mastitis.
Really think carefully about how you'll manage this at work. If you're in an important meeting and it's going longer than expected and you have to leave to pump, think ahead of time about what you'll do or say. Talk to your manager about all of this, if you can.
4. Around 3 to 4 months, your milk supply will drop to only what your baby needs.
If you were a SAHM and exclusively breastfeeding, you'd probably not notice it too much. But as a pumping mom, you'll notice it BIG time and, if you're like most of us, you'll be extremely worried.
Before this drop in supply, you'll be producing huge quantities of milk - more than your LO needs. All of a sudden, you'll set up your pumping equipment, and only 3 ounces will come out. It makes most FTM freak out - we think our baby will starve and this is when many pumping moms start substituting with formula.
Please remember this is NORMAL. Your body will produce MORE than it needs for the first 3 months or so, then it will drop to what your baby needs.
5. OK - last one. Breastfeeding babies, like formula feeding babies, will gradually drink more and more milk as they move from newborn to baby. However, breatfeeding babies cap off between 3 to 4 ounces a feeding. Formula feeding babies keep going until they're drinking 6+ ounces per feeding.
If your daycare provider (or husband or you) don't know this, you'll think your body is not producing enough milk. This is not true.
Formula fed babies have to drink more formula as they grow because they need greater and greater amounts of the appropriate vitamins and nutrients, and the only way to do this is to drink more formula.
Your breastmilk will naturally produce greater amounts of the right vitamins and nutrients within the same volume of milk.
Here's a website with info on this. I had to print this out and give it to my daycare provider, who was concerned that my baby was not getting enough milk because her feedings capped off at 3.5 ounces and stayed there until she was 1 yo and eating only solids at daycare. http://www.kellymom.com
Kelly Mom has tons of good information, including how to maintain or increase milk supply. you'll laugh at this during your first three months - you'll be producing enough milk to feed a small village - but if you continue to pump past three months - you'll be intensely interested in how to maintain a good supply!
OK - one last thing - it's fantastic you want to breastfeed - I breastfed until my LO was 20 months!! But if you decide to switch to formula part-time or full-time because it's just too tough with working, you are NOT a terrible mom. Don't let anyone make you feel guilty about it.
Good luck and congratulations!