Okay, so I have started the switch of putting Sofia on the new formula. WIC switched from similac to gerber, so we had to make the switch. So we were on similac advance to gerber gentle. Anyway, I started a few days ago and did 2 ounces of gerber and 4 ounces of similac. did that for two days and then did 4 ounces of similac and 2 ounces of gerber. Anyway, today her poop has been weird. Like paste/clay consistency and dark green. I figured that her poop would be weird for a week or so. But during three or so of her bottles today, she just whined the whole time.... almost like she was in pain. Anyway, I can deal with the poop but the fussiness just makes me feel bad. I don't want her to be in pain😔 anyone else have this happen to their LO during a formula switch? Or do I need to be calling the doc?