I am breastfeeding my 1 month old and she hasnt passed stool since 6 days she has a tummy ache is this normal?

Breast fed babies can often go many days without passing stool. They are great at absorbing nutrients. As long as she’s feeding well, not vomiting, wetting her diapers and mostly comfortable and continuing to gain good weight she may go as long as 2 weeks without passing stool. See your doctor for any other concerns.

Your child should be under the care of a Pediatrician who will do, along with other things, establish baselines.Variations from tis baselines can be quite instructive. It's never wrong to seek advice. Please call your daughters Pediatrician if you have concerns.