I wait until she gets fussy then add the supplementer.
Today I used the lactaid and she hasn't taken all that much extra milk. I nurse her, she gets fussy, I add the lactaid, she nurses until she stops.
Yesterday she probably took 8 ounces out of the lactaid. Today maybe 2 or 3 so far and it's already 6 pm. She won't take that much more before going to bed.
One of the things that occurred to me is that she has been waking up a lot at night to nurse and she has not been satisfied to nurse in a sidelying position. She wants me to sit up because I think she gets better flow. I do not need a supplementer at night. Last night she only got up a couple times and I didn't need to sit up. I think I will observe the frequency of night feeds to see if she seems to be getting enough during the day.
So based on how things went today, I am okay using the lactaid. I think I'll still get enough stimulation with the way I'm using it.
Thanks for your thoughts.