Ay alam ko yan, nangyari din sa anak ko right after vaccines! Hindi ka nag-iisa, a few of us moms noticed the same thing, looser stools for a day or two after the jab is pretty common kasi ang body ng baby ay nag-aajust sa vaccine. Since pure breastfed siya, that's actually good pa because breast milk is easier sa digestive system niya, but if it continues beyond a few days or may fever pa, better mag-check with pedia just to be sure everything is okay.