Momshie, please check with your pediatrician first about the opened milk, safety lang talaga, kasi ang bacteria growth ay pwedeng mag-isip after a month. Hindi worth the risk sa tummy ng baby, no matter pa kung S26 pa yan! Marami sa amin ang nag-discard na lang ng opened milk after a few days, kaya mas safe. Your pedia will give you the best call dito.