may i know how you store your formula milk??

After the preparation of formula milk, you should always refrigerate any bottles you fill for feedings that will happen later to prevent bacteria from multiplying. Any opened containers of readymade or concentrate formula should also be refrigerated. After 24 hours, make sure to throw away any mixed formula after and any readymade or concentrate formula that has been opened after 48 hours. For formula powder, best to make a fresh bottle each time it's time for feeding as milk powder, unlike formula in a carton, is not sterile.