My supply is dropping

laurie

My son gets about 16oz a day and I am only producing about 11oz a day. I need to get an over supply as I have to go back to work in less than 3 weeks. What can I do to get my supply at least enough for my son. I don't want to give him more formula because I have a good schedule going with him that work for both of us. I am already eating oatmeal lactation cookies but that is not upping my supply.