Info on the freezer stash
http://www.workandpump.com/freezerstash.htm

4-5 ounces in one sitting is quite a bit for a one month old baby. Is baby being fed with a slow flow nipple? Is the feeding paced (breaks included)?

Here is a video that explains how to maximize pump output:
http://newborns.stanford.edu/Breastf...roduction.html

HTH!