I'm a working mom who pumps 4x a day and nurses when we're together. I started the pureed solids on the day my daughter turned 6 months - she's about to turn 8 months. I keep track of my ounces that I pump (more so to keep track of the time rather than the ounces) and I noticed going back to the day I started that my supply has slowly but steadily decreased. To compound matters, my pump started to die and I just replaced it yesterday. I'm not sure how much that affected my supply.
I know that solids will begin to replace breastmilk, but she's not getting that much - just enough for "fun." She gets 1-2 ounces 2x per day, 5 days per week. I don't give her anything at home at night with me, and weekends I usually don't give her anything. I guess I didn't think it would be enough to affect my supply. Does it sound right to you?