Hi...incresed frequency of stools i.e,
6 to 8 times per day is also considered normal in infants..usually they pass stools after every breastfeed..this is called gastrocolic reflex which is normal for that age..and sometimes this is followed by constipation of 3,4 days.
Rotavirus vaccination very rarely can cause this alteration in frequency of stools ..as it is self limited nothing to worry
Next Steps
continue exclusive breastfeeding till 6 months