T.,
Congratulations!
Wow, so many things come to mind as I read your post! Where do I start?
I really recommend that you read a good book about breastfeeding. There really is a lot to know. Here are a few good ones:
The Womanly Art of Breastfeeding, La Leche League
The Breastfeeding Book, Sears
I also recommend La Leche League. If you go to a meeting, most groups have lending libraries you can borrow books from. Also, you will learn a TON at the meetings. You can call their help line to speak to an accredited leader in your area:
###-###-####
www.lllofaz.org
Breastfeeding and bottle feeding are so different. From the way a baby has to suck to what you can expect from your baby, it is all different.
What you are experiencing is normal. If you have been pumping while he has been in the ICU (8-10 times per day), and he is willing/able to breastfeed, then you will be able to cut the bottles out very quickly.
When it comes to breastmilk, there is no "right amount" in terms of ounces or feedings. Every baby has different needs, every mother has a different milk composition, and each meal is different in terms of composition and quantity. It is impossible to say (with accuracy) that a baby needs x number of ounces x number of times per day. This is why the AAP, the World Health Organization, Dr. Sears, La Leche League, and a huge number of other agencies stress the importance of feeding on demand and not a schedule.
Chances are good that a 4 hour schedule for your 2 month old was not an appropriate schedule. Most babies nurse much more frequently. Human babies are supposed to.
Your baby will let you know when he needs to nurse, and if you let him nurse when he wants to, and you put away the pump and the bottles, you will both be fine. It may take a few days for your supply to meet his demands, but he will not go hungry. He will just nurse more frequently.
Here is some helpful research that I love! The research was documented by Dr. Nils Bergman. I have heard him speak and he is wonderful!
Biology gives us a whole body of research on human milk composition which shows us that out of all mammal species, human milk has the lowest amount of fat and protein when compared to other mammal species, here is what that says:
Cache care - These animals must hid their babies and only feed them every 12 hours. They have the highest amount of fat and protien in thier milk. Rabbits, mice
Nest care - These animals leave their babies in a nest for short periods of time, have less fat and protien and feed their babies every 4 hours or so. dog, cat
Follow care - These animals have even less fat and protien than cache and nest animals. Their babies follow them around and they feed every 2 hours or so. Zebra, cow, elk.
Carry care - These animals carry their babies all the time and have the lowest amount of fat and protien. They feed their infants every 30 to 90 minutes. Primates.
Humans have the lowest amount of fat and protien! This is why feeding on demand is so important. When a baby indicates that he is hungry, he is.
I am not telling you to feed your baby every 30 minutes, but please consider it more normal for your baby to feed every hour or two than to feed every 4 hours.
Try to relax and let nature take its course. Watch this wonderful video on the ameda web site which shows a baby's natural instinct to nurse! It is great!
http://www.ameda.com/breastfeeding/elibrary/videos.aspx
Blessings to you and your baby!