My DS is 5 weeks old and has been acting like he is starving to death in the evenings. This has been going on for about 2 weeks. I have been nursing him and pumping to build up my stash, as I go back to work next week. He nurses frequently (and fine) throughout the day (about every hour) and towards the end of the day, I have to do switch nursing. He acts like he is not getting any milk after a few minutes on one side, so I switch him, get another let down, he sucks for a few minutes, crys, then we switch again. Later in the evening the switching doesn't work anymore. He takes a couple of sucks and then screams. He is giving me all the hungry cues, so I know he wants food. My breast do feel empty, but I know there is still SOME milk in there. Plus, I thought with all the nursing and pumping, I should have a huge supply. I let the crying go on for a while, trying to give him the breast, but then end up giving him the bottle of the milk I've pumped that day. I have only been able to pump about 3-4oz each day over the past 2 weeks, and he sucks that down in the evenings like he hasn't had food in forever. After he has the bottle, he is calm enough that he will nurse normally before going to sleep. I hate to think that he is that hungry, but really need to build up my stash or I am going to have to supplement with formula, which I DO NOT want to do. Any advice??