I am thinking that my milk supply is not keeping up with Daniel's growth. He was unsatisfied for a while now, and I don't have the same approach with him as I did with Emma, thinking that my body will keep up. I now know better. I tried to pump a bit each morning to have enough for the evenings, when the supply issue happens, but then I ended up not having enough in the morning either, and having to supplement twice a day, which was not good. I started by pumping 30 ml (one oz) each morning, and weighing him to see how much he ate when he woke up. He would eat 70ml and be hungry still, so I often would give him back the pumped milk, then he was satisfied. I then stopped pumping and he would just eat 100 ml and be happy. This is a lot less time consuming and much more satisfying to both of us. My body just cannot make more than 100 ml, that's the way it is. Pumping first, waiting a bit and feeding later does not change things either, that is the way I am built. The sooner I accepted this, the better it was.
My advice for the lactation-challenged ladies is (after much, much experience with hitting my head against the wall): recognize the problem early. If you think you don't have enough milk, it is likely that you are right. Daniel was gaining 20g per day and doing fine, but with supplementation he is gaining 30 g and he is a lot happier. He only needs 1-2 oz at night extra, but that is what he needs, and I won't argue with it. Second piece of advice: supplement at the breast using something like the SNS or Lactation Aid devices. Bottles are fairly deadly in this situation, because a frustrated hungry baby will always prefer the faster milk flow that comes from the bottle. Third piece of advice: feed often. Allow the baby to soothe-suck at the breast whenever he wants to, it will increase the prolactin levels.
I was lucky enough to have two ladies in town donate milk for him (just as it happened for Emma) and will probably be able to avoid formula until he is a bit older, and perhaps if we are lucky indefinitely :).