I am wondering if my milk supply is enough. It seems like for some feedings I have enough, my breasts feel full and tight and then other times it feels like there is nothing in them, they are very soft. It seems like they are more full after I have supplemented the previous feeding, leaving 4 hours between breastfeeding. When I pump it is also not consistent, sometimes I pump quite a bit (100ml, I think that is a lot, maybe I'm wrong) and other times I pump only 10 ml. I have a 3 week old who was born 3 weeks early at 4lbs 5 oz, so in the very beginning I needed to supplement to get his weight up. Now he is at 6lbs, 5oz and I would really like to only breast feed, not supplement with formula. How can I get my supply to be more consistent?