Re: Up-and-down supply issues
You are correct that many moms feel like their supply is lowest at the end of the day. Prolactin production usually peaks in the night and wee hours of the morning, and then declines over the course of the day. But the neat thing about that biorhythm is that you can tweak it and retrain it by nursing on demand. If you just nurse, your baby's increased demand during the low supply period will eventually Increase your prolactin production and bring your supply up to exactly where it needs to be. If you offer a bottle during that period, though, your supply will respond in the opposite way, interpreting the decreased use of the breast as decreased demand. You could end up in a situation where you are trapped into always offering a bottle at the end of the day.
One thing that a lot of moms have trouble with is the feeling that everything their baby does is somehow an indication of their milk supply. Baby is fussy? Must be low supply! But babies fuss for all kinds of reasons, particularly in the evenings. For a mom who is nursing on demand, supply generally isn't the heart of the issue.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"