I just changed my daughter diaper and her poop was black and there was a lot of it. I've been feeding her Gerber extensive ha mixed with a little soy for two days and I'm wondering if the hypoallergenic formula may have caused it. She has a doctors appointment tomorrow morning. I called and they said to just watch her. She doesn't have a fever or anything like that. Just wondering what it might be? Could it be from the change in diet. I just think it's weird that it happened when I started feeding that to her.