We’ve all been here- and with how hard it can be to find some formulas, I know that it’s devastating to pour unfinished formula down the drain But, your baby’s safety is the most important thing. Formula is no longer good 1 hour after it has touched your baby’s lips. This is because bacteria can be introduced from baby’s mouth and the longer the formula sits out, the more this bacteria can grow and multiply! So while I know it’s painful to toss it— it’s the safest option. Here are some additiona