Ay, ganyan talaga ang transition sa formula, lalo na if medyo heavy ang S26 Plain para sa baby mo, a few of us tried switching din and noticed our babies got constipated for a bit kasi iba ang ingredients. Try increasing water intake muna (like sa pagawa ng formula or between feeds if okay na ang doctor), at check if baby's pooping at least every few days, kung mahigit isang linggo na walang bili or kung super uncomfortable siya, best to run it by your pediatrician na para siguro walang problema. Some moms swear by switching back to Enfamil or trying a different formula, pero importante talaga marinig first ang doctor kung ano ang best move para sa baby mo.