My 3 month old daughter has been having diarrhea for the last 5 days. She only has 1-2 dirty diapers (always diarrhea) a day. She is only formula fed . We give her hypoallergenic formula because milk based formula makes her have blood in her stool. We been using the same type of formula since she was 3 weeks old and never had a problem until now. She is still drinking enough bottles at the end of the day.

What could be causing her to have diarrhea? Is it normal?