I think supplementing too quickly (and I'm not saying you were too quick, I'm just saying in general) is that then the breasts don't get the message that they need to up the supply. Maybe it is different with adoptive bf, though?
It's not just adoptive. It's more of where I was in the natural weaning process. Before the baby came along, I'd gone from pumping 2 ounces in a sitting down to 1/2 an ounce. My body was preparing to stop the nursing process as my bio-son was getting older. I started on dom and that increased the amount I could pump, ,but I don't know that it changed the natural process towards weaning that was happening in my body.
I'm also trying to figure out the best way to deal with tandem nursing a toddler. If he gets to the milk before she does, she's out of luck. During the day I am finding I can often delay him by reading, but at night there's nothing I can do. However, nights usually aren't so bad as daytime for supply. I've only had to supplement once during the night because my son sucked "his side" dry and she didn't get enough from her side. Daytimes though. I guess the problem then is I can delay him if I know she wants to eat, but if I think she doesn't and let him nurse and then she wants to eat, I've got to supplement. But that's not the supplementing we've been talking about. What we talk about here is when he hasn't nursed for awhile and she just wants a few ml to an ounce to top off. And she acts like she is going to die.
Like I said, 4 days in a row without supplements she acted like she was starving.