Pumping question

swartzcl

My daughter is 10 days old, I am strictly pumping but am starting to not be able to keep up with her demands. She is eating around 90ml (3 oz) every 2.5-3 hours. I pump every two hours from around 7 am to 7 pm and then once in the night ( I have to get good sleep sometime). I am pumping around 2-4 oz when I pump. It is getting frustrating because I can't keep up with her and it feels like I am pumping ALL the time. Any suggestions for increasing milk supply or words of encouragement would be greatly appreciated!