Ay hindi na talaga dapat ibalik yan sa bote, mama! Once na na-expose na ng saliva or bacteria from the dropper, mas mataas ang risk ng contamination, especially kung stored lang sa room temperature, better to discard na yan at gamitin fresh dropper next time para safe ang vitamins ng baby. A few of us mums learned this the hard way, kaya ngayon extra careful na kami sa handling, pero honestly kung worried ka pa din, best to ask your pediatrician kung paano exactly i-handle the vitamins ng maayos.