Hello D.!
I too am a first time mommy and have gone overboard on the sterilizng at times, lol. My baby is 10 months now and has just weaned to bottles only. I have 6 bottles that I rotate throughout the day. I sterilized them before first using them. After she is done with a bottle, I go rinse the bottle and it's parts with hot water and leave about 1/4 of water in the bottle and set it aside. When I have all 6 bottles at the end of the day ready to wash, I just rinse again with hot water, wash them out with a bottle brush and wash the nipple, ring and cap with a little bit of dish soap and then hang them on a bottle rack (you can get for about 12.00 at Target). Putting plastic bottles in the dishwasher can release toxins and mix with the milk you put in the bottle when you feed your little one. As for the breast feeding, you can store breastmilk many different ways. In the freezer, they will last 2-3 months in the inside part of the freezer, NOT the door part. Make sure to write the dates on the bags you store them in. Also, something that helped me a great deal, you can add breastmilk throughout the day to a refrigerated bottle and then stick in the freezer at the end of the day. Say you are only able to pump 2 ounces at 10:00 in the morning...then you put the container in the fridge. Then at 2:00, you pump 3 more ounces, you can pour those 3 ounces into the already refrigerated 2 ounces, and so on through out the day, but you can only do this for 24 hours. Then take the finished bottle/ container and transfer from the fridge to the freezer and Whalah! I am a very "must know the right way" or "by the book" way to do things for my baby. I got my information from a place called La Leche League. If you look in the phonebook, call them with any king of question of breastfeeding or storage and they have certified people available at all times. When you call them, it is a recording that names off about 6 certified people with thier names and phone numbers and then you call them directly to thier homes or cell phones....it helped me very much. I have a ton of brand new milk storage bags and a storage container for the freezer if you want them? I ended up staying home and breastfeeding my daughter so i never used them, they are still in sealed packages. I hope it helps. Take Care!