Passing stools after breastfeeding is normal in newborn. It is called as breast  milk stools.no need to worry about it. One need to do adequate burping (Minimum 10 to 15 minutes)  immediately after breastfeeding. Position your baby upside down on tummy ,do patting on lower back immediately after 45 minutes to one hour of breastfeeding,It will help To reduce gaseous distention .Both these actions will reduce vomiting like curd ,crying while passing urine and stool.