L.W.
Hi J.,
L. the lactation consultant here.
Congratulations on your decision to give your milk to your baby. Pumping and feeding with a bottle can be time consuming, but is well worth the effort.
To answer your question: The more often the breasts are "emptied" (breasts are never empty, but removing most of the available milk is considered "emptying") the more milk mother will make. So pumping every two hours should help increase your supply. Most babies your son's age eat about 8 - 12 times in a 24 hour period. If you have a few minutes, please take a look at the explanation of milk production at http://www.kellymom.com/bf/supply/milkproduction.html
Since you are returning to work in a week, it would be a good idea to begin to encourage your baby to take bottles of your milk at intervals that will be manageable when you bring him to daycare.
You can also use this formula to calculate approximately how much milk your baby needs:
1) Convert baby's weight into ounces - 16oz=1 pound
2) Divide baby's weight in ounces by 6
3) The result is the amount of milk needed to gain approximately 4 -6 oz a week
4) Divide this number by the usual number of feedings to get approximate amount of milk to put in each bottle
Source: Riordan and Auerbach, Breastfeeding and Human Lactation, Second Edition,1999, p. 362.
Remember that every baby has a different metabolism and that the results obtained by using guidelines above are just those: guidelines. Obviously, if your baby is hungry, he needs to be fed.
Most mothers pump before leaving for work. It will be important to pump as frequently as you are able at work - pump during a morning break, at lunch, and again during an afternoon break. Then pump as soon as you pick your son up from daycare. For the first few weeks back at work, try to pump every two hours when you are at home and at least three times while you are at work.
Tip: When storing your pump, be sure not to wrap the cord around the adapter. It causes wiring to loosen and the pump won't work as effectively. I see this problem frequently as a factor that lowers milk supply for mothers pumping exclusively.
I hope this information helps you. Returning to work is a big step - please get as much rest as you can and enjoy the time you have with your baby. If you have additional questions or concerns, please let me know.
Happy Mothering!
L.