Mostly... what Saffron said. And just to add, I experienced this too. In fact I think its really, really common. But you always feel like its just you, and you must be doing something terribly wrong. You're not, you're doing great. Best advice I can give, is try not to get too stressed. For a start this won't help your supply. Find someone whose advice you trust eg NCT breast feeding counsellor, lactation consultant (PM me if you would like a name), la leche league etc. Internet forums are great for support, but I did find that I spent hours desperately trying to find the answers and going round in circles with all the different advice. The same actually goes for health professionals. Almost everyone one I saw told me something different which is why I say find someone you trust and stick with them! Also... trust yourself- you say that your baby is well, content, sleeping ok etc. All good and you should be led by her. For my part, I finally ended up taking domperidone which helped my supply, and I did end up supplementing with formula, but my baby's weight issues were more pronounced than what you describe. Don't beat yourself up if this is a route you decide to take (formula ain't poison after all), but don't feel that it IS a route you have to take, although you may feel some pressure to do so. Hopefully this is just a glitch and your baby will continue to thrive, as it sounds like she's been doing. All the best.