No it may be because of some stomach infection, just give breastfeeding to your child with every stool poop feed him
That should be enough
If she is passing urine regularly than no need to worry your breast feed is sufficient
Next Steps
stop any thing by mouth even water except your breast feed
Health Tips
take a healthy easily digestible and frequent diet for your self,
avoid outside or heavy rich food
stop taking too much sweet or sugary items in your diet take lot of mikk curd
good protein diet
take your breakfast as early as possible in morning preferably before 9'O clock