Hi Mom,
You'll know if it happens. Baby will have massive diarrhea, very watery, so fierce that it's scary.
Then, the problem is dehydration. You can try Pedialyte and other replacement fluids, but you won't be able to keep up with the fluid loss. She should be hospitalized FAST for IV fluids and antibiotics.
Have I scared you enough? Good! Now check this link: http://familydoctor.org/242.xml
There are other beasties in animal (and human) feces besides E. coli that can cause the same picture. It will be up the hospital lab to figure out which it is.
Right now, it sounds like a cold.
Good luck. I hope she gets better soon. You don't need any problems.
Teaching Doc
http://familydoctor.org/242.xml
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