Hay nako, alam ko yan! A few of us moms noticed na may slight constipation or delayed pooping after vaccines, lalo na after 6in1, it's usually just a mild reaction kaya wag mag-alala, pero if it's been 2 days na talaga, I'd suggest checking with your pedia just to be sure, especially if baby looks uncomfortable or may fever pa. Most of the time kasi it passes in a day or two, pero better safe na alam natin exactly kung ano ang happening, diba?